Clone MediaWiki in CI so the 1.46+ PHPUnit config can be generated

The GitHub tarball omits export-ignored files such as phpunit.xml.template,
which MediaWiki 1.46 and later need to generate their PHPUnit config. Clone the
repository instead, and bump the MediaWiki cache key so stale tarball caches are
rebuilt.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: JeroenDeDauw

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
             mediawiki
             !mediawiki/extensions/
             !mediawiki/vendor/
-          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v1
+          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v2
 
       - name: Cache Composer cache
         uses: actions/cache@v4
@@ -131,7 +131,7 @@ jobs:
             mediawiki
             mediawiki/extensions/
             mediawiki/vendor/
-          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v1
+          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v2
 
       - name: Cache Composer cache
         uses: actions/cache@v4
@@ -200,7 +200,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.composer/cache
-          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v1
+          key: mw_${{ matrix.mw }}-php${{ matrix.php }}_v2
 
       - uses: actions/checkout@v4
         with:

.github/workflows/installMediaWiki.sh

@@ -3,10 +3,9 @@
 MW_BRANCH=$1
 EXTENSION_NAME=$2
 
-wget "https://github.com/wikimedia/mediawiki/archive/refs/heads/$MW_BRANCH.tar.gz" -nv
-
-tar -zxf $MW_BRANCH.tar.gz
-mv mediawiki-$MW_BRANCH mediawiki
+# Clone rather than download the tarball: since MediaWiki 1.46 the test runner needs
+# phpunit.xml.template, which is marked export-ignore and therefore absent from tarballs.
+git clone --depth=1 --branch="$MW_BRANCH" https://github.com/wikimedia/mediawiki.git mediawiki
 
 cd mediawiki