Build/Test Tools: Run test workflows on old branches on a schedule.

On TravisCI, old branches still receiving security updates were tested on a regular basis. This ensured tests continued to pass as time passed even if updates were not made to these branches.

On GitHub Actions, there is no interface to configure this (TravisCI had a UI), but there is a `schedule` event that can trigger workflow runs on cron that can be used to accomplish the same thing.

This introduces a workflow file that runs twice a month (on the 1st and 15th) to verify the tests within older branches.

Because the `schedule` event only runs within the primary branch, the appropriate workflows in each old branch will be triggered manually through the `workflow_dispatch` trigger using the GitHub REST API. `workflow_dispatch` will need to be added to all workflows in all old branches in order for the event to dispatch successfully.

Merges [50590] to the 5.7 branch.
See #52653.

git-svn-id: https://develop.svn.wordpress.org/branches/5.7@50591 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/coding-standards.yml

@@ -32,6 +32,7 @@ on:
       - 'phpcs.xml.dist'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/*.yml'
+  workflow_dispatch:
 
 jobs:
   # Runs PHP coding standards checks.

.github/workflows/end-to-end-tests.yml

@@ -17,6 +17,7 @@ on:
       - trunk
       - '5.[3-9]'
       - '[6-9].[0-9]'
+  workflow_dispatch:
 
 env:
   LOCAL_DIR: build

.github/workflows/javascript-tests.yml

@@ -30,6 +30,7 @@ on:
       - 'tests/qunit/**'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/*.yml'
+  workflow_dispatch:
 
 jobs:
   # Runs the QUnit tests for WordPress.

.github/workflows/php-compatibility.yml

@@ -26,6 +26,7 @@ on:
       - 'phpcompat.xml.dist'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/*.yml'
+  workflow_dispatch:
 
 jobs:
 

.github/workflows/phpunit-tests.yml

@@ -14,6 +14,7 @@ on:
       - master
       - '3.[7-9]'
       - '[4-9].[0-9]'
+  workflow_dispatch:
   # Once weekly On Sundays at 00:00 UTC.
   schedule:
     - cron: '0 0 * * 0'

.github/workflows/test-npm.yml

@@ -23,6 +23,7 @@ on:
       - '**.css'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/**.yml'
+  workflow_dispatch:
 
 env:
   PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}

.github/workflows/test-old-branches.yml

@@ -0,0 +1,58 @@
+name: Test old branches
+
+on:
+  # Once weekly On Mondays at 00:00 UTC.
+  schedule:
+    - cron: '0 0 1,15 * *'
+
+jobs:
+  dispatch-workflows-for-old-branches:
+    name: ${{ matrix.workflow }} for ${{ matrix.branch }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        workflow: [
+            'coding-standards.yml',
+            'javascript-tests.yml',
+            'phpunit-tests.yml',
+            'test-npm.yml'
+        ]
+        branch: [
+            '5.7', '5.6', '5.5', '5.4', '5.3', '5.2', '5.1', '5.0',
+            '4.9', '4.8', '4.7', '4.6', '4.5', '4.4', '4.3', '4.2', '4.1', '4.0',
+            '3.9', '3.8', '3.7'
+        ]
+        include:
+          # PHP Compatibility testing was introduced in 5.5.
+          - branch: '5.7'
+            workflow: 'php-compatibility.yml'
+          - branch: '5.6'
+            workflow: 'php-compatibility.yml'
+          - branch: '5.5'
+            workflow: 'php-compatibility.yml'
+
+          # End to End testing was introduced in 5.3 but later removed as there were no meaningful assertions.
+          # Only the officially supported major branch runs E2E tests so that more assertions can be added, and the
+          # workflow does not continue to run needlessly on old branches.
+          - branch: '5.7'
+            workflow: 'end-to-end-tests.yml'
+        exclude:
+          # Coding standards and JavaScript testing did not take place in 3.7.
+          - branch: '3.7'
+            workflow: 'coding-standards.yml'
+          - branch: '3.7'
+            workflow: 'javascript-tests.yml'
+
+    steps:
+      - name: Dispatch workflow run
+        uses: actions/github-script@47f7cf65b5ced0830a325f705cad64f2f58dddf7 # v3.1.0
+        with:
+          github-token: ${{ secrets.GHA_OLD_BRANCH_DISPATCH }}
+          script: |
+            github.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: '${{ matrix.workflow }}',
+              ref: '${{ matrix.branch }}'
+            });