Fold PHPCS and PHPStan into one job and test PHP 8.5

The two jobs were identical up to their final step, each paying for its own
Setup PHP. That step is the flaky one (#178), so running it twice to reach
two short commands was two chances for a run to fall over instead of one.
They are now steps in a single Coding Standards & Static Analysis job.

The one thing given up is that PHPCS failing now stops the job before
PHPStan reports, where before the two ran in parallel and both spoke. That
seemed a fair trade for halving the exposure, and the fix for a PHPCS
failure rarely depends on knowing PHPStan's verdict at the same time.

PHP 8.5 joins the test matrix. composer.json already allows it at >=8.1
and the suite passes on 8.5.9 locally: 915 tests, PHPStan and PHPCS clean,
check-platform-reqs satisfied. 8.4 is deliberately not added, only 8.5.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Uw545F1vveNJKjzLxdi2ks

.gitea/workflows/ci.yml

@@ -8,8 +8,13 @@ on:
   pull_request:
 
 jobs:
-  lint:
-    name: Coding Standards
+  # PHPCS and PHPStan share a job so the two of them draw once on Setup PHP
+  # rather than twice. That step is slow and intermittently fails on 8.3
+  # (see #178), so every job that can be folded into another is one less
+  # chance for a run to fall over. They run as separate steps, and PHPCS
+  # failing stops the job before PHPStan reports.
+  quality:
+    name: Coding Standards & Static Analysis
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -32,28 +37,6 @@ jobs:
       - name: Run PHPCS
         run: composer cs
 
-
-  static-analysis:
-    name: PHPStan
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: '8.3'
-          tools: composer:v2
-
-      - name: Cache Composer packages
-        uses: actions/cache@v3
-        with:
-          path: ~/.composer/cache
-          key: composer-${{ hashFiles('composer.json') }}
-
-      - name: Install dependencies
-        run: composer install --prefer-dist --no-progress --no-interaction
-
       - name: Run PHPStan
         run: composer lint
 
@@ -67,6 +50,7 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
+          - '8.5'
     steps:
       - uses: actions/checkout@v4
 
@@ -108,7 +92,7 @@ jobs:
     runs-on: ubuntu-latest
     # Only build a shippable artifact once changes land on main, and only
     # after the quality gates pass.
-    needs: [lint, static-analysis, test, no-debug]
+    needs: [quality, test, no-debug]
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - uses: actions/checkout@v4