Fix GHA CI Workdir

Author: andysnell

.github/actions/ci-php-command-action/action.yaml

@@ -70,6 +70,7 @@ runs:
           --pull=missing \
           --env COMPOSER_CACHE_DIR="build/composer" \
           --volume ${{ github.workspace }}:/app \
+          --workdir /app \
           composer:latest \
           ${{ inputs.composer_command }}
 
@@ -86,5 +87,6 @@ runs:
         --user="$(id -u):$(id -g)" \
         --pull=missing \
         --volume ${{ github.workspace }}:/app \
+        --workdir /app \
           php:${{ inputs.php-version }}-cli-alpine \
           ${{ inputs.command }}