Set up custom Postgres image

Author: zachlatta

.github/workflows/docker-build.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'warehouse-postgres-docker/**'
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: hackclub/warehouse-postgres
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=17
+            type=raw,value=17-{{sha}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./warehouse-postgres-docker
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+

.gitmodules

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+[submodule "warehouse-postgres-docker/vendor/pg_xxhash"]
+	path = warehouse-postgres-docker/vendor/pg_xxhash
+	url = https://github.com/hatarist/pg_xxhash.git

warehouse-postgres-docker/Dockerfile

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+ARG BASE_IMAGE=postgres:17-alpine
+
+## Custom Alpine Postgres docker file with pg_xxhash extension
+FROM ${BASE_IMAGE} AS builder
+
+# Install required dependencies for building the extension
+RUN apk --no-cache add \
+    make \
+    gcc \
+    g++ \
+    clang19 \
+    llvm19 \
+    postgresql-dev
+
+# Copy the vendored pg_xxhash source
+COPY vendor/pg_xxhash /xxhash
+
+WORKDIR /xxhash
+
+# Build and install the extension
+RUN make && make install
+
+## Final image - start fresh from base
+FROM ${BASE_IMAGE}
+
+## Copy all extensions from the builder stage
+COPY --from=builder /usr/local/lib/postgresql/* /usr/local/lib/postgresql/
+COPY --from=builder /usr/local/share/postgresql/extension/* /usr/local/share/postgresql/extension/
+