Update CI workflows to modern standards

.codespellrc

@@ -0,0 +1,7 @@
+# See: https://github.com/codespell-project/codespell#using-a-config-file
+[codespell]
+# In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:
+ignore-words-list = ,
+check-filenames =
+check-hidden =
+skip = ./.git,./extras/TrustAnchors,./src/bearssl

.github/workflows/compile-examples.yml

@@ -1,5 +1,6 @@
 name: Compile Examples
 
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
 on:
   pull_request:
     paths:
@@ -11,6 +12,11 @@ on:
       - .github/workflows/compile-examples.yml
       - examples/**
       - src/**
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to external resources (libraries, platforms).
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
 
 jobs:
   build:
@@ -23,7 +29,10 @@ jobs:
         - source-path: ./
         - name: ArduinoECCX08
       # sketch paths to compile (recursive) for all boards
-      UNIVERSAL_SKETCH_PATHS: '"examples/SHA1" "examples/SHA256"'
+      UNIVERSAL_SKETCH_PATHS: |
+        - examples/SHA1
+        - examples/SHA256
+      SKETCHES_REPORTS_PATH: sketches-reports
 
     strategy:
       fail-fast: false
@@ -44,33 +53,38 @@ jobs:
               type: wifi101
             libraries: |
               - name: WiFi101
-            sketch-paths: '"examples/WiFiSSLClient"'
+            sketch-paths: |
+              - examples/WiFiSSLClient
           # GSM boards
           - board:
               type: gsm
             libraries: |
               - name: MKRGSM
-            sketch-paths: '"examples/MKRGSMSSLClient"'
+            sketch-paths: |
+              - examples/MKRGSMSSLClient
 
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
       - name: Compile examples
-        uses: per1234/actions/libraries/compile-examples@beaac5ae4bb7ab294f1305e436172fde4c281fc8
+        uses: arduino/compile-sketches@main
         with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
           fqbn: ${{ matrix.board.fqbn }}
           libraries: |
             ${{ env.UNIVERSAL_LIBRARIES }}
             ${{ matrix.libraries }}
-          sketch-paths: ${{ env.UNIVERSAL_SKETCH_PATHS }} ${{ matrix.sketch-paths }}
-          size-report-sketch: SHA256
-          enable-size-deltas-report: true
+          sketch-paths: |
+            ${{ env.UNIVERSAL_SKETCH_PATHS }}
+            ${{ matrix.sketch-paths }}
           verbose: true
+          enable-deltas-report: true
+          sketches-report-path: ${{ env.SKETCHES_REPORTS_PATH }}
 
       - name: Save sketches report as artifact
         if: github.event_name == 'pull_request'
         uses: actions/upload-artifact@v2
         with:
-          name: size-deltas-reports
-          path: size-deltas-reports
+          path: ${{ env.SKETCHES_REPORTS_PATH }}
+          name: ${{ env.SKETCHES_REPORTS_PATH }}

.github/workflows/report-size-deltas.yml

@@ -1,14 +1,25 @@
 name: Report Size Deltas
 
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
 on:
+  push:
+    paths:
+      - ".github/workflows/report-size-deltas.yml"
   schedule:
-    # schedule action for every five minutes (ends up being a little longer in practice)
+    # Run at the minimum interval allowed by GitHub Actions.
+    # Note: GitHub Actions periodically has outages which result in workflow failures.
+    # In this event, the workflows will start passing again once the service recovers.
     - cron: "*/5 * * * *"
+  workflow_dispatch:
+  repository_dispatch:
 
 jobs:
   report:
     runs-on: ubuntu-latest
 
     steps:
       - name: Comment size deltas reports to PRs
-        uses: arduino/actions/libraries/report-size-deltas@master
+        uses: arduino/report-size-deltas@main
+        with:
+          # The name of the workflow artifact created by the sketch compilation workflow
+          sketches-reports-source: sketches-reports

.github/workflows/spell-check.yml

@@ -1,17 +1,22 @@
 name: Spell Check
 
-on: [push, pull_request]
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch new misspelling detections resulting from dictionary updates.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
 
 jobs:
   spellcheck:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
+      - name: Checkout repository
         uses: actions/checkout@v2
 
       - name: Spell check
-        uses: arduino/actions/libraries/spell-check@master
-        with:
-          ignore-words-list: extras/codespell-ignore-words-list.txt
-          skip-paths: ./extras/TrustAnchors,./src/bearssl
+        uses: codespell-project/actions-codespell@master