Optimize CI by using a custom Docker container with pre-installed dependencies.

This change introduces a Docker container (`.ci/container/Dockerfile`) that pre-installs:
- OpenJDK 8 (ZuluFX), 11, 17, 21, and 25 (Zulu).
- Android SDK (command-line tools, platform-tools, build-tools) and NDK dependencies.
- Ant, Maven, Python 3.
- Codename One binaries (`cn1-binaries`).
- Required libraries for headless UI testing (xvfb, libgl1-mesa-dri).

Updates `pr.yml`, `ant.yml`, and `scripts-android.yml` to run jobs inside this container (`ghcr.io/codenameone/codenameone/ci-container:latest`), removing redundant setup steps (JDK download, tool installation) to improve build speed and reproducibility.

The workflow `.github/workflows/build-container.yml` is added to build and push this container image to GHCR, ensuring the image tag is always lowercase to comply with registry requirements.

Also updates `scripts/setup-workspace.sh` to respect the `CN1_BINARIES` environment variable and handle the pre-configured environment correctly.

Author: google-labs-jules[bot]

.ci/container/Dockerfile

@@ -19,6 +19,8 @@ RUN apt-get update && apt-get install -y \
     libxxf86vm1 \
     ant \
     maven \
+    libncurses5 \
+    libstdc++6 \
     && rm -rf /var/lib/apt/lists/*
 
 # Setup Azul Repo
@@ -44,14 +46,9 @@ RUN mkdir -p /usr/lib/jvm/zulu8-fx && \
 # Clone cn1-binaries
 RUN git clone --depth=1 https://github.com/codenameone/cn1-binaries /opt/cn1-binaries
 
-# Set Environment Variables
-ENV JAVA_HOME=/usr/lib/jvm/zulu8-fx
-ENV PATH=$JAVA_HOME/bin:$PATH
-
+# Set Environment Variables for JDKs (Paths for apt installed JDKs usually symlinked to /usr/lib/jvm/zulu-XX-amd64)
 ENV JAVA8_HOME=/usr/lib/jvm/zulu8-fx
 ENV JDK8_HOME=/usr/lib/jvm/zulu8-fx
-
-# Paths for apt installed JDKs (usually symlinked to /usr/lib/jvm/zulu-XX-amd64)
 ENV JAVA11_HOME=/usr/lib/jvm/zulu-11-amd64
 ENV JDK11_HOME=/usr/lib/jvm/zulu-11-amd64
 ENV JAVA17_HOME=/usr/lib/jvm/zulu-17-amd64
@@ -61,6 +58,28 @@ ENV JDK21_HOME=/usr/lib/jvm/zulu-21-amd64
 ENV JAVA25_HOME=/usr/lib/jvm/zulu-25-amd64
 ENV JDK25_HOME=/usr/lib/jvm/zulu-25-amd64
 
+# Install Android SDK
+ENV ANDROID_HOME=/opt/android-sdk
+ENV ANDROID_SDK_ROOT=/opt/android-sdk
+ENV CMDLINE_TOOLS_URL="https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip"
+
+RUN mkdir -p ${ANDROID_HOME}/cmdline-tools && \
+    wget -q ${CMDLINE_TOOLS_URL} -O /tmp/cmdline-tools.zip && \
+    unzip -q /tmp/cmdline-tools.zip -d ${ANDROID_HOME}/cmdline-tools && \
+    mv ${ANDROID_HOME}/cmdline-tools/cmdline-tools ${ANDROID_HOME}/cmdline-tools/latest && \
+    rm /tmp/cmdline-tools.zip
+
+ENV PATH=${ANDROID_HOME}/cmdline-tools/latest/bin:${ANDROID_HOME}/platform-tools:${ANDROID_HOME}/emulator:${PATH}
+
+# Accept licenses and install packages
+# Note: sdkmanager requires Java 11+ to run. We use JAVA17_HOME for this step.
+RUN yes | JAVA_HOME=${JAVA17_HOME} sdkmanager --licenses && \
+    JAVA_HOME=${JAVA17_HOME} sdkmanager "platform-tools" "platforms;android-31" "build-tools;31.0.0"
+
+# Set Default JAVA_HOME to Java 8 (as per user requirement for builds)
+ENV JAVA_HOME=/usr/lib/jvm/zulu8-fx
+ENV PATH=$JAVA_HOME/bin:$PATH
+
 ENV CN1_BINARIES=/opt/cn1-binaries
 
 # Verify installations
@@ -71,4 +90,5 @@ RUN java -version && \
     $JAVA25_HOME/bin/java -version && \
     ant -version && \
     mvn -version && \
-    python3 --version
+    python3 --version && \
+    JAVA_HOME=${JAVA17_HOME} sdkmanager --version

.github/workflows/ant.yml

@@ -12,7 +12,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/${{ github.repository }}/ci-container:latest
+      image: ghcr.io/codenameone/codenameone/ci-container:latest
 
     steps:
     - uses: actions/checkout@v1

.github/workflows/build-container.yml

@@ -9,7 +9,6 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}/ci-container
 
 jobs:
   build-and-push:
@@ -22,6 +21,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Downcase Image Name
+        run: |
+          echo "IMAGE_NAME=${GITHUB_REPOSITORY,,}/ci-container" >> ${GITHUB_ENV}
+
       - name: Log in to the Container registry
         uses: docker/login-action@v3
         with:

.github/workflows/pr.yml

@@ -38,7 +38,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/${{ github.repository }}/ci-container:latest
+      image: ghcr.io/codenameone/codenameone/ci-container:latest
 
     steps:
     - uses: actions/checkout@v1

.github/workflows/scripts-android.yml

@@ -91,7 +91,7 @@ jobs:
       issues: write
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/${{ github.repository }}/ci-container:latest
+      image: ghcr.io/codenameone/codenameone/ci-container:latest
       options: --privileged -v /dev/kvm:/dev/kvm
     env:
       GITHUB_TOKEN: ${{ secrets.CN1SS_GH_TOKEN }}
@@ -108,6 +108,9 @@ jobs:
       - name: Set JDK_HOME
         if: matrix.id != 'default'
         run: echo "JDK_HOME=/usr/lib/jvm/zulu-${{ matrix.java_version }}-amd64" >> $GITHUB_ENV
+      - name: Set JDK_HOME (Default)
+        if: matrix.id == 'default'
+        run: echo "JDK_HOME=${JDK8_HOME}" >> $GITHUB_ENV
       - name: Configure CN1SS options
         if: matrix.id != 'default'
         run: |