image cleanup a little bit and arm64 release

.gitea/workflows/release.yml

@@ -28,13 +28,14 @@ jobs:
         run: |
           FLUTTER_VERSION=$(curl -s https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json | \
             jq -r '. as $root | $root.current_release.stable as $stable_hash | $root.releases[] | select(.hash == $stable_hash) | .version')
-          echo "FLUTTER_VERSION=$FLUTTER_VERSION" >> $GITHUB_ENV
+          echo "FLUTTER_VERSION=${FLUTTER_VERSION}-stable" >> $GITHUB_ENV
           echo "Latest Flutter version: $FLUTTER_VERSION"
 
       - name: Check if Docker image exists
         id: check_image
         run: |
           IMAGE_TAG="${IMAGE_NAME}:${FLUTTER_VERSION}"
+          echo "Checking ${IMAGE_TAG}..."
           if docker manifest inspect $IMAGE_TAG > /dev/null 2>&1; then
             echo "Image already exists for $FLUTTER_VERSION"
             echo "exists=true" >> $GITHUB_OUTPUT
@@ -70,6 +71,7 @@ jobs:
         if: steps.check_image.outputs.exists == 'false'
         run: |
           docker buildx build \
+            --platform linux/amd64,linux/arm64 \
             --build-arg FLUTTER_VERSION=${{ env.FLUTTER_VERSION }} \
             --provenance=true \
             --sbom=true \

Dockerfile

@@ -13,6 +13,8 @@ RUN apt-get install -y \
           libgtk-3-dev liblzma-dev \
           libstdc++-12-dev
 
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+
 ENV FLUTTER_HOME=/opt/flutter
 ENV PATH="$FLUTTER_HOME/bin:$PATH"
 
@@ -24,6 +26,12 @@ RUN git config --global --add safe.directory /opt/flutter
 
 RUN flutter --version
 
+RUN rm -rf $FLUTTER_HOME/.pub-cache \
+           $FLUTTER_HOME/examples \
+           $FLUTTER_HOME/dev \
+           $FLUTTER_HOME/.git \
+           $FLUTTER_HOME/packages/flutter_tools/test
+
 WORKDIR /workspace
 
 CMD [ "bash" ]