Initial docker image

.github/workflows/publish_docker.yaml

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+name: Create and publish a Docker image
+
+on:
+  push:
+    branches: ["main"]
+    tags: ["*"]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    name: Push Docker image to GitHub container repository
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/${{ github.repository }}
+
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM debian:bullseye-slim
+
+# Set up work directory
+WORKDIR /app
+
+# Install squid-deb-proxy then cleanup
+RUN apt-get update -y \
+    && apt-get install -y --no-install-recommends \
+      squid-deb-proxy \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Add an entrypoint script
+COPY entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+# Start with a blank set of allowed domains
+RUN echo "# Default deny all" > /etc/squid-deb-proxy/mirror-dstdomain.acl
+
+# Set all files in /app/allowlists as allowed domains
+RUN mkdir -p /app/allowlists && \
+    rm -rf /etc/squid-deb-proxy/mirror-dstdomain.acl.d && \
+    ln -sf /app/allowlists /etc/squid-deb-proxy/mirror-dstdomain.acl.d
+
+EXPOSE 8000/tcp
+
+ENTRYPOINT ["/app/entrypoint.sh"]

entrypoint.sh

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+#! /usr/bin/env sh
+
+# Start the proxy
+/etc/init.d/squid-deb-proxy restart
+
+# Watch the log
+touch /var/log/squid-deb-proxy/access.log
+tail -f /var/log/squid-deb-proxy/access.log