Add multi-arch Docker build and manifest to CI workflow

Refactors the build-docker GitHub Actions workflow to build and push Docker images for both amd64 and arm64 architectures using a matrix strategy. Adds a manifest job to create and push a multi-arch manifest for the lthn/chain image, supporting both 'testnet' and 'latest' tags based on input.

.github/workflows/build-docker.yml

@@ -14,39 +14,90 @@ on:
         default: testnet
         required: false
         type: string
+env:
+  LTHN_TAG: ${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}
 
 jobs:
   build:
-    name: "lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}"
-    runs-on: ubuntu-22.04
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      matrix:
+        include:
+          - arch: amd64
+            runner: ubuntu-latest
+            tag: ${{ env.LTHN_TAG }}-amd64
+            platform: linux/amd64
+          - arch: arm64
+            runner: ubuntu-arm
+            tag: ${{ env.LTHN_TAG }}-arm64
+            platform: linux/arm64
     steps:
-      - name: Checkout Project
-        uses: actions/checkout@v4.2.2
-        with:
-          fetch-depth: 0
-          submodules: recursive
+      - uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Login to DockerHub
+      - name: Log in to DockerHub
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-
-      - name: Build and push
-        id: docker_build
+      - name: Build and push image
         uses: docker/build-push-action@v6
         with:
+          context: .
           file: utils/docker/images/lthn-chain/Dockerfile
-          context: ${{ github.workspace }}
           push: true
-          build-args: |
-            BUILD_TESTNET=${{ inputs.chain-network == 'testnet' && '1' || '0' }}
-            THREADS=2
-            BUILD_TARGET=gcc-linux-x86_64
-            BUILD_LOCAL=1
-          tags: lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}
+          platforms: ${{ matrix.platform }}
+          tags: lthn/chain:${{ matrix.tag }}
 
+  manifest:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Log in to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Create and push manifest
+        run: |
+          docker manifest create lthn/chain:${{ env.LTHN_TAG }} \
+            lthn/chain:${{ env.LTHN_TAG }}-amd64 \
+            lthn/chain:${{ env.LTHN_TAG }}-arm64
+          docker manifest push lthn/chain:${{ env.LTHN_TAG }}
+#  build:
+#    name: "lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}"
+#    runs-on: ubuntu-24.04
+#    steps:
+#      - name: Checkout Project
+#        uses: actions/checkout@v4.2.2
+#        with:
+#          fetch-depth: 0
+#          submodules: recursive
+#
+#      - name: Set up Docker Buildx
+#        uses: docker/setup-buildx-action@v3
+#
+#      - name: Login to DockerHub
+#        uses: docker/login-action@v3
+#        with:
+#          username: ${{ secrets.DOCKERHUB_USERNAME }}
+#          password: ${{ secrets.DOCKERHUB_TOKEN }}
+#
+#
+#      - name: Build and push
+#        id: docker_build
+#        uses: docker/build-push-action@v6
+#        with:
+#          file: utils/docker/images/lthn-chain/Dockerfile
+#          context: ${{ github.workspace }}
+#          push: true
+#          build-args: |
+#            BUILD_TESTNET=${{ inputs.chain-network == 'testnet' && '1' || '0' }}
+#            THREADS=2
+#            BUILD_LOCAL=1
+#          tags: lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}
+#