Implement arm64 docker image

This is a far simpler CI path:
* Compiles Ubuntu targets outside of docker
* Copies targets into appropriate docker image
* No compilation inside docker - makes it far faster
* Runs all integration tests on all platforms using emulation against host-based postgis

Fixes #655

.github/workflows/ci.yml

@@ -285,6 +285,122 @@ jobs:
         env:
           DATABASE_URL: postgres://${{ env.PGUSER }}:${{ env.PGUSER }}@${{ env.PGHOST }}:${{ job.services.postgres.ports[5432] }}/${{ env.PGDATABASE }}?sslmode=${{ matrix.sslmode }}
 
+  docker:
+    name: Build docker images
+    runs-on: ubuntu-latest
+    needs: [ build ]
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: docker_meta
+        uses: docker/metadata-action@v5
+        # https://github.com/docker/metadata-action
+        with:
+          images: ghcr.io/${{ github.repository }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        # https://github.com/docker/setup-qemu-action
+        with:
+          platforms: linux/amd64,linux/arm64
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        # https://github.com/docker/setup-buildx-action
+        with:
+          install: true
+          platforms: linux/amd64,linux/arm64
+
+      - run: rm -rf target_releases
+      - uses: actions/download-artifact@v3
+        with:
+          name: build-aarch64-unknown-linux-gnu
+          path: target_releases/linux/arm64
+      - uses: actions/download-artifact@v3
+        with:
+          name: build-x86_64-unknown-linux-gnu
+          path: target_releases/linux/amd64
+      - name: Reset permissions
+        run: chmod -R +x target_releases/
+
+      - name: Start postgres
+        uses: nyurik/action-setup-postgis@v1
+        id: pg
+        with:
+          username: test
+          password: test
+          database: test
+          rights: --superuser
+      - name: Init database
+        shell: bash
+        run: tests/fixtures/initdb.sh
+        env:
+          DATABASE_URL: ${{ steps.pg.outputs.connection-uri }}
+
+      - name: Build linux/arm64 Docker image
+        id: docker_aarch64-unknown-linux-gnu
+        uses: docker/build-push-action@v5
+        # https://github.com/docker/build-push-action
+        with:
+          context: .
+          file: multi-platform.Dockerfile
+          load: true
+          tags: ${{ github.repository }}:linux-arm64
+          platforms: linux/arm64
+      - name: Test linux/arm64 Docker image
+        run: |
+          PLATFORM=linux/arm64
+          TAG=${{ github.repository }}:linux-arm64
+          export MBTILES_BUILD=-
+          export MBTILES_BIN="docker run --rm --net host --platform $PLATFORM -e DATABASE_URL -v $PWD/tests:/tests --entrypoint /usr/local/bin/mbtiles $TAG"
+          export MARTIN_BUILD=-
+          export MARTIN_BIN="docker run --rm --net host --platform $PLATFORM -e DATABASE_URL -v $PWD/tests:/tests $TAG"
+          tests/test.sh
+        env:
+          DATABASE_URL: ${{ steps.pg.outputs.connection-uri }}
+
+      - name: Build linux/amd64 Docker image
+        id: docker_x86_64-unknown-linux-gnu
+        uses: docker/build-push-action@v5
+        # https://github.com/docker/build-push-action
+        with:
+          context: .
+          file: multi-platform.Dockerfile
+          load: true
+          tags: ${{ github.repository }}:linux-amd64
+          platforms: linux/amd64
+      - name: Test linux/amd64 Docker image
+        run: |
+          PLATFORM=linux/amd64
+          TAG=${{ github.repository }}:linux-amd64
+          export MBTILES_BUILD=-
+          export MBTILES_BIN="docker run --rm --net host --platform $PLATFORM -e DATABASE_URL -v $PWD/tests:/tests --entrypoint /usr/local/bin/mbtiles $TAG"
+          export MARTIN_BUILD=-
+          export MARTIN_BIN="docker run --rm --net host --platform $PLATFORM -e DATABASE_URL -v $PWD/tests:/tests $TAG"
+          tests/test.sh
+        env:
+          DATABASE_URL: ${{ steps.pg.outputs.connection-uri }}
+
+      - name: Login to GitHub Docker registry
+        if: github.event_name != 'pull_request' }}
+        uses: docker/login-action@v3
+        # https://github.com/docker/login-action
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push the Docker image
+        if: github.event_name != 'pull_request' }}
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: multi-platform.Dockerfile
+          push: true
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+
   package:
     name: Package ${{ matrix.target }}
     runs-on: ${{ matrix.os }}
@@ -359,7 +475,7 @@ jobs:
   done:
     name: CI Finished
     runs-on: ubuntu-latest
-    needs: [ package ]
+    needs: [ docker, package ]
     steps:
       - name: Finished
         run: echo "CI finished successfully"