feat: build images for multiple platforms

.github/workflows/build-loki-image.yml

@@ -13,6 +13,13 @@ on:
 jobs:
   loki-image:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+          - linux/arm
     steps:
       - name: pull loki code
         uses: actions/checkout@v3
@@ -21,13 +28,30 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: ">=1.21.3"
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
       - name: set up docker buildx
         uses: docker/setup-buildx-action@v3
-        with:
-          platforms: linux/amd64,linux/arm64,linux/arm
-          driver: docker-container
-          install: true  # setup docker build alias
-          driver-opts: --output "type=image"
-      - name: build image
+      - name: parse image metadata
+        id: parse-metadata
+        shell: bash
+        # TODO: this version will come from key cmd/loki in release manifest
+        # version=$(jq -r '."cmd/loki"' .release-please-manifest.json)
         run: |
-          make BUILD_IN_CONTAINER=false loki-image
+          platform="$(echo "${{ matrix.platform}}" |  sed  "s/\(.*\)\/\(.*\)/\1-\2/"
+          echo "platform=${platform}" >> $GITHUB_OUTPUT
+
+          version="1.2.0"
+          echo "version=${version}" >> $GITHUB_OUTPUT
+      - name: Build and export
+        uses: docker/build-push-action@v5
+        with:
+          context: cmd/loki
+          platforms: ${{ matrix.platform }}
+          tags: grafana/loki:${{ steps.parse-metadata.outputs.version }}
+          outputs: type=docker,dest=/dist/loki-${{ steps.parse-metadata.outputs.version}}-${{ steps.parse-metadata.outputs.platform) }}.tar
+      - name: upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: loki-image-${{ matrix.platform }}
+          path: dist/loki-${{ steps.parse-metadata.outputs.platform) }}.tar