Add workflow

.forgejo/workflows/docker-image.yaml

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+name: docker-image
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Login to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.hamburg.ccc.de
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: git.hamburg.ccc.de/ccchh/hmdooris/hmdooris:latest

Dockerfile

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+FROM docker.io/library/debian:12-slim AS builder
+RUN apt-get update && \
+    apt-get install --no-install-suggests --no-install-recommends --yes pipx
+ENV PATH="/root/.local/bin:${PATH}"
+RUN pipx install poetry
+RUN pipx inject poetry poetry-plugin-bundle
+WORKDIR /src
+COPY . .
+RUN poetry bundle venv --python=/usr/bin/python3 --only=main /venv
+
+FROM gcr.io/distroless/python3-debian12
+COPY --from=builder /venv /venv
+COPY hmdooris/ /hmdooris
+ENTRYPOINT ["/venv/bin/python", "-m", "hmdooris"]