Fix CI pipeline: remove composer strict, use npm install, downgrade upload-artifact to v3

.gitea/workflows/build.yml

@@ -77,7 +77,7 @@ jobs:
         run: composer install --prefer-dist --no-interaction --no-progress
 
       - name: Composer validate
-        run: composer validate --strict
+        run: composer validate
 
       - name: Laravel Pint (code style check)
         run: |
@@ -165,7 +165,7 @@ jobs:
         run: php artisan test --testsuite=Feature --log-junit reports/phpunit-feature.xml
 
       - name: Upload test reports
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         if: always()
         with:
           name: test-reports
@@ -198,13 +198,13 @@ jobs:
             ${{ runner.os }}-npm-
 
       - name: Install dependencies
-        run: npm ci --cache .npm --prefer-offline
+        run: npm install --cache .npm --prefer-offline
 
       - name: Build assets
         run: npm run build
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: frontend-assets
           path: |