feat(ci): Add GitHub Actions workflow for building and publishing Docker images

- Create a new workflow for Docker image build and publish
- Configure triggers for push and pull_request on main branch
- Set up QEMU and Docker Buildx for multi-platform builds
- Implement Docker login for GitHub Container Registry
- Include Docker image metadata extraction and tagging

.github/workflows/docker.yml

@@ -0,0 +1,65 @@
+name: Build and Publish Docker Images
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set lowercase image name
+        run: |
+          echo "IMAGE_NAME=${GITHUB_REPOSITORY,,}" >> ${GITHUB_ENV}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -1,6 +1,5 @@
 # hadolint global ignore=SC1090,SC1091
-
-ARG ARCHITECTURE=$(uname -m)
+ARG ARCHITECTURE
 
 #Source
 FROM scratch AS release
@@ -21,6 +20,7 @@ RUN if [ "$ARCHITECTURE" = "x86_64" ]; then \
 
 #Archipelago
 FROM python:3.12-slim AS archipelago
+LABEL org.opencontainers.image.source https://github.com/a-priestley/Archipelago
 ENV VIRTUAL_ENV=/opt/venv
 ENV PYTHONUNBUFFERED=1
 WORKDIR /app