Speed up docker build (#3627)

.github/workflows/docker-image.yml

@@ -2,29 +2,46 @@ name: Build and Publish Docker Image
 
 on:
   release:
-    types: [created]
+    types: [published]
   workflow_dispatch:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
-  PLATFORMS: linux/amd64,linux/arm64
 
 jobs:
-  build-and-publish:
+  build:
+    name: Build Images
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
     permissions:
       contents: read
       packages: write
 
     steps:
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+          echo "IMAGE_NAME=${REGISTRY}/${GITHUB_REPOSITORY@L}" >> $GITHUB_ENV
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - name: Setup Docker buildx
         uses: docker/setup-buildx-action@v3.1.0
         with:
-          platforms: ${{ env.PLATFORMS }}
+          platforms: ${{ matrix.platform }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5.0.0
+        with:
+          images: ${{ env.IMAGE_NAME }}
 
       - name: Log into registry ${{ env.REGISTRY }}
         uses: docker/login-action@v3.0.0
@@ -33,19 +50,68 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract Docker metadata
-        id: meta
-        uses: docker/metadata-action@v5.0.0
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-
-      - name: Build and push Docker image
-        id: build-and-push
+      - name: Build Docker image
+        id: build
         uses: docker/build-push-action@v5.1.0
         with:
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: ${{ env.PLATFORMS }}
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
           cache-from: type=gha
           cache-to: type=gha,mode=max
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"     
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Merge and Publish
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - name: Prepare
+        run: |
+          echo "IMAGE_NAME=${REGISTRY}/${GITHUB_REPOSITORY@L}" >> $GITHUB_ENV
+
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_NAME }}
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        uses: docker/login-action@v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.IMAGE_NAME }}@sha256:%s ' *)
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}

Dockerfile

@@ -1,10 +1,26 @@
-FROM rust:alpine AS build
+FROM --platform=$BUILDPLATFORM tonistiigi/xx AS xx
+FROM --platform=$BUILDPLATFORM rust:alpine AS build
+COPY --from=xx / /
+
+RUN apk add --no-cache clang lld
 COPY . /app
 WORKDIR /app
-RUN apk add --update musl-dev openssl-dev openssl-libs-static \
-    && CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse \
-    OPENSSL_NO_PKG_CONFIG=1 OPENSSL_STATIC=1 OPENSSL_DIR=/usr/ \
-    cargo build -p typst-cli --release
+RUN --mount=type=cache,target=/root/.cargo/git/db \
+    --mount=type=cache,target=/root/.cargo/registry/cache \
+    --mount=type=cache,target=/root/.cargo/registry/index \
+    CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse \
+    cargo fetch
+
+ARG TARGETPLATFORM
+RUN xx-apk add --no-cache musl-dev openssl-dev openssl-libs-static
+RUN --mount=type=cache,target=/root/.cargo/git/db \
+    --mount=type=cache,target=/root/.cargo/registry/cache \
+    --mount=type=cache,target=/root/.cargo/registry/index \
+    OPENSSL_NO_PKG_CONFIG=1 OPENSSL_STATIC=1 \
+    OPENSSL_DIR=$(xx-info is-cross && echo /$(xx-info)/usr/ || echo /usr) \
+    xx-cargo build -p typst-cli --release && \
+    cp target/$(xx-cargo --print-target-triple)/release/typst target/release/typst && \
+    xx-verify target/release/typst
 
 FROM alpine:latest
 WORKDIR /root/