feat: build & push docker image

.dockerignore

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+.git
+.clj-kondo
+.yarn
+.shadow-cljs
+.lsp
+node_modules
+resources/public/js/compiled

.github/workflows/build.yml

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+---
+name: Build & Push Docker
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-docker:
+    runs-on: ubuntu-latest
+    if: github.repository == 'xtdb/xt-fiddle' && github.ref == 'refs/heads/main'
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM clojure:tools-deps-alpine AS frontend-build
+WORKDIR /app
+
+# Install build deps
+RUN apk add --update nodejs npm yarn
+
+# Install node deps
+COPY package.json .yarnrc.yml yarn.lock .
+RUN yarn install
+
+# Install clojure build deps
+COPY deps.edn .
+RUN clojure -A:cljs -P
+
+# Build the frontend
+# TODO: Copy over only cljs files?
+COPY . .
+RUN npx shadow-cljs release app
+
+
+FROM clojure:tools-deps-alpine
+WORKDIR /app
+
+# Install the runtime deps
+COPY deps.edn .
+RUN clojure -P
+
+# Add the source & frontend code
+COPY --from=frontend-build /app/resources/public/js/compiled /app/resources/public/js/compiled
+# TODO: Copy over only clj files?
+COPY . .
+CMD clojure -X:prod