GH Actions: fix cs annotations not showing

As things are, the CS check for the PHPCS codebase is run in the `test` workflow as an integration test and will show inline annotations about code style issues in PRs. These annotations are intended to help contributors identify issues with their PR.

As the `test` workflow is run against a large range of PHP versions and OSes, this showing of the annotations was limited to PHP 8.4 + Ubuntu to prevent the contributor seeing a wall of duplicate annotations when issues would be found (one for each test build).

However, the `test` workflow also uses the "fail-fast" option, cancelling the builds on the first failure, which means the PHP 8.4/Ubuntu build may have been cancelled before it was run, in which case, the inline CS annotations don't show at all.

This means the current setup is counter-productive as in most cases, PR annotations will not show, even when they should be shown.

This commit intends to fix this by adding a separate CS run against PHP "latest" to the `validate` workflow.
This CS run in the `validate` workflow will now trigger the showing of annotations, and as this job is stand-alone, will not be subject to cancellation due to other builds failing.
The code related to showing the annotations has been removed from the `test` workflow.

Yes, this does mean the CS check will have a semi-duplicated run in the `test` workflow.
I do not see this as a problem as:
1. The _intention_ behind that run is different ("integration test" vs "cs check").
2. The CS run in the `test` workflow is run with different settings - `--no-cache --parallel=1` -, meaning more variations of PHPCS CLI args are tested.

Author: jrfnl

.github/workflows/test.yml

@@ -195,7 +195,6 @@ jobs:
           php-version: ${{ matrix.php }}
           ini-values: ${{ steps.set_ini.outputs.PHP_INI }}
           coverage: none
-          tools: cs2pr
 
       - name: "DEBUG: show libxml loaded version (php)"
         run: php -r 'echo "libxml loaded version = ", LIBXML_LOADED_VERSION, PHP_EOL;'
@@ -240,14 +239,7 @@ jobs:
 
       - name: 'PHPCS: check code style without cache, no parallel'
         if: ${{ matrix.custom_ini == false }}
-        id: phpcs
-        run: >
-          php "bin/phpcs" --no-cache --parallel=1
-          ${{ matrix.os == 'ubuntu-latest' && matrix.php == '8.4' && '--report-full --report-checkstyle=./phpcs-report.xml' || '' }}
-
-      - name: Show PHPCS results in PR
-        if: ${{ always() && steps.phpcs.outcome == 'failure' && matrix.os == 'ubuntu-latest' && matrix.php == '8.4' }}
-        run: cs2pr ./phpcs-report.xml
+        run: php "bin/phpcs" --no-cache --parallel=1
 
       - name: Download the PHPCS phar
         if: ${{ matrix.custom_ini == false }}

.github/workflows/validate.yml

@@ -17,6 +17,32 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  phpcs:
+    name: Check PHP code style
+    runs-on: ubuntu-latest
+
+    # Don't run the cronjob in this workflow on forks.
+    if: github.event_name != 'schedule' || (github.event_name == 'schedule' && github.repository_owner == 'PHPCSStandards')
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 'latest'
+          coverage: none
+          tools: cs2pr
+
+      - name: Check PHP code style
+        id: phpcs
+        run: php "bin/phpcs" --report-full --report-checkstyle=./phpcs-report.xml
+
+      - name: Show PHPCS results in PR
+        if: ${{ always() && steps.phpcs.outcome == 'failure' }}
+        run: cs2pr ./phpcs-report.xml
+
   checkxml:
     name: Check XML files
     runs-on: ubuntu-latest