test on ubuntu-22.04 instance

.github/workflows/acceptance_test.yml

@@ -19,17 +19,20 @@ on:
 concurrency:
   group: ${{ github.head_ref }}
   cancel-in-progress: true
+
+defaults:
+  job:
+    runs-on: ubuntu-22.04
+
 jobs:
   fail_if_pull_request_is_draft: # Fails in order to indicate that pull request needs to be marked as ready to review to pass.
     if: github.event.pull_request.draft == true
-    runs-on: ubuntu-latest
     steps:
       - name: Fail if PR is a draft
         run: exit 1
   pre_ci:
     name: Prepare CI environment
     if: github.event.pull_request.draft == false # Skip this job and its dependencies if the PR is draft
-    runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
         uses: actions/checkout@v4
@@ -53,13 +56,11 @@ jobs:
   validate-gradle-wrapper:
     if: "!contains(needs.pre_ci.outputs.commit_message, '[acceptance test skip]')"
     needs: pre_ci
-    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: gradle/actions/wrapper-validation@v3
   pack-snapshot:
     needs: [ validate-gradle-wrapper ]
-    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Set up JDK 11
@@ -89,7 +90,6 @@ jobs:
           path: output-comparator/build/libs/output-comparator-*-cli.jar
   pack-master:
     needs: [ validate-gradle-wrapper ]
-    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
         with:
@@ -117,7 +117,6 @@ jobs:
   fetch-urls:
     if: "!contains(needs.pre_ci.outputs.commit_message, '[acceptance test skip]')"
     needs: pre_ci
-    runs-on: ubuntu-latest
     steps:
       - name: Checkout repository code
         uses: actions/checkout@v4
@@ -142,7 +141,7 @@ jobs:
     needs: [ fetch-urls, pack-master, pack-snapshot ]
     # We use machines with more memory to run validation, as large feeds
     # can consume too much heap for default machine instances (see #1304).
-    runs-on: ubuntu-latest-4-cores
+#    runs-on: ubuntu-latest-4-cores
     strategy:
       matrix: ${{ fromJson(needs.fetch-urls.outputs.matrix) }}
     steps:
@@ -174,7 +173,6 @@ jobs:
           name: reports_${{ env.CONCATENATED_IDS }}
           path: ${{ github.sha }}/output
   merge-reports-artifacts:
-     runs-on: ubuntu-latest
      needs: [ get-reports ]
      steps:
        - name: Merge Artifacts
@@ -185,7 +183,6 @@ jobs:
            delete-merged: true
   compare-outputs:
     needs: [ merge-reports-artifacts ]
-    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Download comparator .jar file from previous job