Build/Test Tools: Add input for disabling AppArmor.

Old branches requiring outdated versions of Chromium to run JavaScript tests have recently started failing as a result of the `ubuntu-latest` container being updated to point to `ubuntu-24`.

This introduces a new input to the reusable JavaScript testing workflow to allow a fix to be used without having to update Chromium or tests in these branches.

Props swissspidy.
See #62808.

git-svn-id: https://develop.svn.wordpress.org/trunk@59635 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/reusable-javascript-tests.yml

@@ -5,6 +5,12 @@ name: JavaScript tests
 
 on:
   workflow_call:
+    inputs:
+      disable-apparmor:
+        description: 'Whether to disable AppArmor.'
+        required: false
+        type: 'boolean'
+        default: false
 
 jobs:
   # Runs the QUnit test suite.
@@ -44,6 +50,15 @@ jobs:
       - name: Install npm Dependencies
         run: npm ci
 
+      # Older branches using outdated versions of Puppeteer fail on newer versions of the `ubuntu-24` image.
+      # This disables AppArmor in order to work around those failures.
+      #
+      # See https://issues.chromium.org/issues/373753919
+      # and https://chromium.googlesource.com/chromium/src/+/main/docs/security/apparmor-userns-restrictions.md
+      - name: Disable AppArmor
+        if: ${{ inputs.disable-apparmor }}
+        run: echo 0 | sudo tee /proc/sys/kernel/apparmor_restrict_unprivileged_userns
+
       - name: Run QUnit tests
         run: npm run grunt qunit:compiled