feat: add Docker image build/push to the release workflow

Adds a Dockerfile and .dockerignore, and extends the tag-triggered
release workflow with a job that builds and pushes the image to
GitHub Container Registry (ghcr.io) alongside the existing
wheel/sdist GitHub release. Tags the image with the release version
and, for non-prerelease tags, also tags it "latest".

Author: SIDDHANTCOOKIE

.dockerignore

@@ -0,0 +1,17 @@
+.git
+.github
+.pytest_cache
+__pycache__
+*.pyc
+.minichain
+tests/
+examples/
+public/
+bore.zip
+bore_bin/
+dist/
+build/
+*.egg-info/
+README.md
+Contributors.md
+DCO.md

.github/workflows/release.yml

@@ -7,6 +7,7 @@ on:
 
 permissions:
   contents: write
+  packages: write
 
 jobs:
   build-and-release:
@@ -40,3 +41,36 @@ jobs:
           files: dist/*
           generate_release_notes: true
           prerelease: ${{ steps.prerelease.outputs.is_prerelease }}
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Compute image tags
+        id: image
+        run: |
+          IMAGE="ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')"
+          TAGS="${IMAGE}:${GITHUB_REF_NAME}"
+          if [[ ! "${GITHUB_REF_NAME}" =~ (a|b|rc)[0-9]+$ ]]; then
+            TAGS="${TAGS}"$'\n'"${IMAGE}:latest"
+          fi
+          {
+            echo "tags<<EOF"
+            echo "$TAGS"
+            echo "EOF"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Build and push image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.image.outputs.tags }}

Dockerfile

@@ -0,0 +1,14 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY main.py genesis.json ./
+COPY minichain/ ./minichain/
+
+EXPOSE 9000 8545
+
+ENTRYPOINT ["python", "main.py"]
+CMD ["--host", "0.0.0.0", "--port", "9000"]