Decrease running time of phpstan job

The job used the baseinstall script which does the setup of a whole installation
but we only need composer for phpstan.

I've removed & renamed that script as it wasn't used anywhere else. In
the future we can add the relevant sections again and toggle the needed
steps to make sure we don't replicate the needed steps. For example the
unit tests don't need a judgehost installed, neither do the webstandard
jobs.

Another solution would have been to use our container but as we need
docker there and some other parts (phpstan action builds it own
container inside ours in that case) this was the easier solution.

The different shell functions are now fully POSIX complaint as we ran
with bash first together with some aliases which we can't easily expand.

.github/jobs/composer_setup.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -eux
+
+# Store artifacts/logs
+export ARTIFACTS="/tmp/artifacts"
+mkdir -p "$ARTIFACTS"
+
+# Functions to annotate the Github actions logs
+trace_on () {
+    set -x
+}
+
+trace_off () {
+    {
+        set +x
+    } 2>/dev/null
+}
+
+section_start_internal () {
+    echo "::group::$1"
+    trace_on
+}
+
+section_end_internal () {
+    echo "::endgroup::"
+    trace_on
+}
+
+section_start () {
+    if [ "$#" -ne 1 ]; then
+        echo "Only 1 argument is needed for GHA, 2 was needed for GitLab."
+        exit 1
+    fi
+    trace_off
+    section_start_internal "$1"
+}
+
+section_end () {
+    trace_off
+    section_end_internal
+}
+
+section_start "Configure PHP"
+PHPVERSION=$(php -r 'echo PHP_MAJOR_VERSION.".".PHP_MINOR_VERSION."\n";')
+export PHPVERSION
+echo "$PHPVERSION" | tee -a "$ARTIFACTS"/phpversion.txt
+section_end
+
+section_start "Run composer"
+composer install --no-scripts 2>&1 | tee -a "$ARTIFACTS/composer_log.txt"
+section_end

.github/workflows/phpstan.yml

@@ -14,10 +14,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install DOMjudge
-        run: .github/jobs/baseinstall.sh admin
+      - name: Setup composer dependencies
+        run: .github/jobs/composer_setup.sh
       - uses: php-actions/phpstan@v3
         with:
           configuration: phpstan.dist.neon
           path: webapp/src webapp/tests
           php_extensions: gd intl mysqli pcntl zip
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          path: /tmp/artifacts