diff --git a/.github/workflows/branches-and-prs.main.kts b/.github/workflows/branches-and-prs.main.kts
index 9025113acd..78a38b9024 100755
--- a/.github/workflows/branches-and-prs.main.kts
+++ b/.github/workflows/branches-and-prs.main.kts
@@ -47,7 +47,6 @@ workflow(
         MergeGroup()
     ),
     sourceFile = __FILE__,
-    targetFileName = "${__FILE__.name.substringBeforeLast(".main.kts")}.yml",
     // https://stackoverflow.com/a/72408109/16358266
     concurrency = Concurrency(
         group = "${expr { github.workflow }}-${expr("${github.eventPullRequest.pull_request.number} || ${github.ref}")}",
@@ -76,12 +75,18 @@ workflow(
         )
     }
 
+    val matrix = Matrix.full
+    with(__FILE__.parentFile.resolve("../../codecov.yml")) {
+        readText()
+            .replace("after_n_builds:.*+$".toRegex(), "after_n_builds: ${matrix.size}")
+            .let(::writeText)
+    }
     job(
         id = "build-and-verify",
         name = "Build and Verify",
         runsOn = RunnerType.Custom(expr(Matrix.operatingSystem)),
         strategy = Strategy(
-            matrix = Matrix.full
+            matrix = matrix
         )
     ) {
         uses(
@@ -111,7 +116,9 @@ workflow(
         )
         uses(
             name = "Upload to Codecov.io",
-            action = CodecovAction()
+            action = CodecovAction(
+                failCiIfError = true
+            )
         )
     }
 }
diff --git a/.github/workflows/branches-and-prs.yml b/.github/workflows/branches-and-prs.yaml
similarity index 94%
rename from .github/workflows/branches-and-prs.yml
rename to .github/workflows/branches-and-prs.yaml
index 67a09b6c3c..49e0587a7e 100644
--- a/.github/workflows/branches-and-prs.yml
+++ b/.github/workflows/branches-and-prs.yaml
@@ -23,10 +23,10 @@ jobs:
       uses: 'actions/checkout@v4'
     - id: 'step-1'
       name: 'Execute script'
-      run: 'rm ''.github/workflows/branches-and-prs.yml'' && ''.github/workflows/branches-and-prs.main.kts'''
+      run: 'rm ''.github/workflows/branches-and-prs.yaml'' && ''.github/workflows/branches-and-prs.main.kts'''
     - id: 'step-2'
       name: 'Consistency check'
-      run: 'git diff --exit-code ''.github/workflows/branches-and-prs.yml'''
+      run: 'git diff --exit-code ''.github/workflows/branches-and-prs.yaml'''
   check_all_workflow_yaml_consistency:
     name: 'Check all Workflow YAML Consistency'
     runs-on: 'ubuntu-latest'
@@ -112,3 +112,5 @@ jobs:
     - id: 'step-3'
       name: 'Upload to Codecov.io'
       uses: 'codecov/codecov-action@v5'
+      with:
+        fail_ci_if_error: 'true'
diff --git a/.github/workflows/codeql-analysis.main.kts b/.github/workflows/codeql-analysis.main.kts
index 1c9e1e5562..5b914c4e7e 100755
--- a/.github/workflows/codeql-analysis.main.kts
+++ b/.github/workflows/codeql-analysis.main.kts
@@ -55,7 +55,6 @@ workflow(
         )
     ),
     sourceFile = __FILE__,
-    targetFileName = "${__FILE__.name.substringBeforeLast(".main.kts")}.yml",
     // https://stackoverflow.com/a/72408109/16358266
     concurrency = Concurrency(
         group = "${expr { github.workflow }}-${expr("${github.eventPullRequest.pull_request.number} || ${github.ref}")}",
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yaml
similarity index 93%
rename from .github/workflows/codeql-analysis.yml
rename to .github/workflows/codeql-analysis.yaml
index 755b3faf1b..8757e31019 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yaml
@@ -24,10 +24,10 @@ jobs:
       uses: 'actions/checkout@v4'
     - id: 'step-1'
       name: 'Execute script'
-      run: 'rm ''.github/workflows/codeql-analysis.yml'' && ''.github/workflows/codeql-analysis.main.kts'''
+      run: 'rm ''.github/workflows/codeql-analysis.yaml'' && ''.github/workflows/codeql-analysis.main.kts'''
     - id: 'step-2'
       name: 'Consistency check'
-      run: 'git diff --exit-code ''.github/workflows/codeql-analysis.yml'''
+      run: 'git diff --exit-code ''.github/workflows/codeql-analysis.yaml'''
   codeql-build:
     name: 'CodeQL-Build'
     runs-on: 'ubuntu-latest'
diff --git a/.github/workflows/common.main.kts b/.github/workflows/common.main.kts
index 894d471bbb..33aefb3cf5 100755
--- a/.github/workflows/common.main.kts
+++ b/.github/workflows/common.main.kts
@@ -55,6 +55,13 @@ data class Matrix(
     val exclude: (Element.() -> Boolean)? = null,
     val includes: List<Element>? = null
 ) {
+    val size by lazy {
+        originalElements
+            .filterNot(exclude ?: { true })
+            .size +
+            (includes?.size ?: 0)
+    }
+
     private val originalElements by lazy {
         (operatingSystems ?: listOf(null))
             .map { Element(operatingSystem = it) }
diff --git a/.github/workflows/docs-pr.main.kts b/.github/workflows/docs-pr.main.kts
index 1334f7566f..e3c9c04448 100755
--- a/.github/workflows/docs-pr.main.kts
+++ b/.github/workflows/docs-pr.main.kts
@@ -46,7 +46,6 @@ workflow(
         MergeGroup()
     ),
     sourceFile = __FILE__,
-    targetFileName = "${__FILE__.name.substringBeforeLast(".main.kts")}.yml",
     // https://stackoverflow.com/a/72408109/16358266
     concurrency = Concurrency(
         group = "${expr { github.workflow }}-${expr("${github.eventPullRequest.pull_request.number} || ${github.ref}")}",
diff --git a/.github/workflows/docs-pr.yml b/.github/workflows/docs-pr.yaml
similarity index 90%
rename from .github/workflows/docs-pr.yml
rename to .github/workflows/docs-pr.yaml
index dc5e4cda86..35cbf4244a 100644
--- a/.github/workflows/docs-pr.yml
+++ b/.github/workflows/docs-pr.yaml
@@ -23,10 +23,10 @@ jobs:
       uses: 'actions/checkout@v4'
     - id: 'step-1'
       name: 'Execute script'
-      run: 'rm ''.github/workflows/docs-pr.yml'' && ''.github/workflows/docs-pr.main.kts'''
+      run: 'rm ''.github/workflows/docs-pr.yaml'' && ''.github/workflows/docs-pr.main.kts'''
     - id: 'step-2'
       name: 'Consistency check'
-      run: 'git diff --exit-code ''.github/workflows/docs-pr.yml'''
+      run: 'git diff --exit-code ''.github/workflows/docs-pr.yaml'''
   docs-and-javadoc:
     name: 'Docs and JavaDoc'
     runs-on: 'ubuntu-latest'
diff --git a/.github/workflows/release.main.kts b/.github/workflows/release.main.kts
index d7119dd767..c8c0fd2cb0 100755
--- a/.github/workflows/release.main.kts
+++ b/.github/workflows/release.main.kts
@@ -39,21 +39,26 @@ workflow(
             tags = listOf("spock-*")
         )
     ),
-    sourceFile = __FILE__,
-    targetFileName = "${__FILE__.name.substringBeforeLast(".main.kts")}.yml"
+    sourceFile = __FILE__
 ) {
     val GITHUB_TOKEN by secrets
     val SONATYPE_OSS_USER by secrets
     val SONATYPE_OSS_PASSWORD by secrets
     val SIGNING_GPG_PASSWORD by secrets
 
+    val matrix = Matrix.full
+    with(__FILE__.parentFile.resolve("../../codecov.yml")) {
+        readText()
+            .replace("after_n_builds:.*+$".toRegex(), "after_n_builds: ${matrix.size}")
+            .let(::writeText)
+    }
     val buildAndVerify = job(
         id = "build-and-verify",
         name = "Build and Verify",
         runsOn = RunnerType.Custom(expr(Matrix.operatingSystem)),
         condition = "${github.repository} == 'spockframework/spock'",
         strategy = Strategy(
-            matrix = Matrix.full
+            matrix = matrix
         )
     ) {
         uses(
@@ -87,7 +92,9 @@ workflow(
         )
         uses(
             name = "Upload to Codecov.io",
-            action = CodecovAction()
+            action = CodecovAction(
+                failCiIfError = true
+            )
         )
     }
     val releaseSpock = job(
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yaml
similarity index 95%
rename from .github/workflows/release.yml
rename to .github/workflows/release.yaml
index d1ad9b36c1..ec302d72f4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yaml
@@ -19,10 +19,10 @@ jobs:
       uses: 'actions/checkout@v4'
     - id: 'step-1'
       name: 'Execute script'
-      run: 'rm ''.github/workflows/release.yml'' && ''.github/workflows/release.main.kts'''
+      run: 'rm ''.github/workflows/release.yaml'' && ''.github/workflows/release.main.kts'''
     - id: 'step-2'
       name: 'Consistency check'
-      run: 'git diff --exit-code ''.github/workflows/release.yml'''
+      run: 'git diff --exit-code ''.github/workflows/release.yaml'''
   build-and-verify:
     name: 'Build and Verify'
     runs-on: '${{ matrix.os }}'
@@ -95,6 +95,8 @@ jobs:
     - id: 'step-4'
       name: 'Upload to Codecov.io'
       uses: 'codecov/codecov-action@v5'
+      with:
+        fail_ci_if_error: 'true'
   release-spock:
     name: 'Release Spock'
     runs-on: '${{ matrix.os }}'
diff --git a/build-logic/preprocess-workflows/src/main/groovy/org/spockframework/gradle/PreprocessWorkflowsPlugin.groovy b/build-logic/preprocess-workflows/src/main/groovy/org/spockframework/gradle/PreprocessWorkflowsPlugin.groovy
index d04c8161fc..d9136c9074 100644
--- a/build-logic/preprocess-workflows/src/main/groovy/org/spockframework/gradle/PreprocessWorkflowsPlugin.groovy
+++ b/build-logic/preprocess-workflows/src/main/groovy/org/spockframework/gradle/PreprocessWorkflowsPlugin.groovy
@@ -68,7 +68,7 @@ class PreprocessWorkflowsPlugin implements Plugin<Project> {
           .files(getImportedFiles(project.file(workflowScript)))
           .withPropertyName("importedFiles")
         it.outputs
-          .file(new File(workflowScript.parent, "${workflowName}.yml"))
+          .file(new File(workflowScript.parent, "${workflowName}.yaml"))
           .withPropertyName('workflowFile')
 
         it.javaLauncher.set project.extensions.getByType(JavaToolchainService).launcherFor {
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000000..599046d6e8
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,6 @@
+codecov:
+  max_report_age: off
+
+comment:
+  layout: "reach, diff, flags, files"
+  after_n_builds: 18