added workflow

.gitea/workflows/release.yml

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+name: Build Flutter Docker Image
+
+on:
+  schedule:
+    - cron: '0 3 * * *' # Every day at 03:00 UTC
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: singatias/flutter
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y jq curl
+
+      - name: Get latest Flutter version
+        id: flutter_version
+        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 "Latest Flutter version: $FLUTTER_VERSION"
+
+      - name: Check if Docker image exists
+        id: check_image
+        run: |
+          IMAGE_TAG="${IMAGE_NAME}:${FLUTTER_VERSION}"
+          if docker manifest inspect $IMAGE_TAG > /dev/null 2>&1; then
+            echo "Image already exists for $FLUTTER_VERSION"
+            echo "exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "Image does not exist for $FLUTTER_VERSION"
+            echo "exists=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Log in to DockerHub
+        if: steps.check_image.outputs.exists == 'false'
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
+
+      - name: Build, push, and generate SBOM and provenance
+        if: steps.check_image.outputs.exists == 'false'
+        run: |
+          docker buildx build \
+            --provenance=true \
+            --sbom=true \
+            --push \
+            -t ${{ IMAGE_NAME }}:${{ FLUTTER_VERSION }} \
+            -t ${{ IMAGE_NAME }}:latest \
+            .

.gitignore

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+.idea/
+

Dockerfile

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+FROM debian:stable-slim
+
+ARG FLUTTER_VERSION=3.32.3-stable
+
+RUN apt-get update -y
+RUN apt-get upgrade -y
+
+RUN apt-get install -y curl git unzip xz-utils zip libglu1-mesa
+
+RUN apt-get install -y \
+          clang cmake git \
+          ninja-build pkg-config \
+          libgtk-3-dev liblzma-dev \
+          libstdc++-12-dev
+
+ENV FLUTTER_HOME=/opt/flutter
+ENV PATH="$FLUTTER_HOME/bin:$PATH"
+
+# Download and extract Flutter SDK
+RUN curl -L "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}.tar.xz" \
+    | tar -xJ -C /opt
+
+RUN git config --global --add safe.directory /opt/flutter
+
+RUN flutter --version
+
+WORKDIR /workspace
+
+CMD [ "bash" ]