.gitea/workflows/demo.yaml

@@ -84,6 +84,8 @@ jobs:
   backend-jobs:
     name: Set up Java for Backend Tests and Build
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/adoptium/temurin:21-jdk
 
     steps:
       # Checkout repository
@@ -96,38 +98,6 @@ jobs:
           git clone --quiet "$CLONE_URL_WITH_AUTH" .
           echo "Repository cloned successfully."
 
-      # Manual Java 21 installation
-      - name: Install OpenJDK 21 manually
-        run: |
-          set -e
-          # Detect if running in act
-          if command -v act >/dev/null 2>&1; then
-            echo "Detected act runner, installing Java 21 via apt silently..."
-          fi
-
-          # Install prerequisites silently
-          sudo apt-get update -qq
-          sudo apt-get install -y -qq wget tar gzip gnupg --no-install-recommends
-
-          # Download OpenJDK 21 tar.gz from Eclipse Temurin (or AdoptOpenJDK)
-          JDK_VERSION="21.0.0+35"
-          JDK_DIR="/opt/jdk-21"
-          TMP_TAR="/tmp/openjdk-21.tar.gz"
-          wget -qO "$TMP_TAR" "https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.0%2B35/OpenJDK21U-jdk_x64_linux_hotspot_21.0.0_35.tar.gz"
-
-          # Extract silently
-          sudo mkdir -p "$JDK_DIR"
-          sudo tar --strip-components=1 -xzf "$TMP_TAR" -C "$JDK_DIR" >/dev/null
-
-          # Set environment variables for all steps
-          echo "JAVA_HOME=$JDK_DIR" | sudo tee /etc/profile.d/jdk21.sh
-          echo "PATH=$JDK_DIR/bin:\$PATH" | sudo tee -a /etc/profile.d/jdk21.sh
-          export JAVA_HOME="$JDK_DIR"
-          export PATH="$JAVA_HOME/bin:$PATH"
-
-          java -version
-          echo "OpenJDK 21 installed successfully."
-
       # Install Maven manually
       - name: Install Maven silently
         run: |
@@ -154,8 +124,7 @@ jobs:
       # Run backend tests and build
       - name: Test & build backend
         working-directory: ./src
-        run: |
-          mvn clean verify -B
+        run: mvn clean verify -B
 
       - name: Done
         run: echo "Workflow successfully completed."