ci: Build tools image separately for different archs (#2302)

.github/workflows/update_docker_ci.yml

@@ -194,8 +194,8 @@ jobs:
           dockerhub_repo: rippleci/clio_clang
           dockerhub_description: Clang compiler for XRPLF/clio.
 
-  tools:
-    name: Build and push tools docker image
+  tools-amd64:
+    name: Build and push tools docker image (amd64)
     runs-on: heavy
     needs: [gcc-merge]
 
@@ -218,16 +218,85 @@ jobs:
           push_image: ${{ github.event_name != 'pull_request' }}
           directory: docker/tools
           tags: |
-            type=raw,value=latest
-            type=raw,value=${{ github.sha }}
-          platforms: linux/amd64,linux/arm64
+            type=raw,value=amd64-latest
+            type=raw,value=amd64-${{ github.sha }}
+          platforms: linux/amd64
           build_args: |
             GCC_VERSION=${{ env.GCC_VERSION }}
 
+  tools-arm64:
+    name: Build and push tools docker image (arm64)
+    runs-on: heavy-arm64
+    needs: [gcc-merge]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
+        with:
+          files: "docker/tools/**"
+
+      - uses: ./.github/actions/build_docker_image
+        if: steps.changed-files.outputs.any_changed == 'true'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          images: |
+            ${{ env.GHCR_REPO }}/clio-tools
+          push_image: ${{ github.event_name != 'pull_request' }}
+          directory: docker/tools
+          tags: |
+            type=raw,value=arm64-latest
+            type=raw,value=arm64-${{ github.sha }}
+          platforms: linux/arm64
+          build_args: |
+            GCC_VERSION=${{ env.GCC_VERSION }}
+
+  tools-merge:
+    name: Merge and push multi-arch tools docker image
+    runs-on: heavy
+    needs: [tools-amd64, tools-arm64]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
+        with:
+          files: "docker/tools/**"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Make GHCR_REPO lowercase
+        run: |
+          echo "GHCR_REPO_LC=$(echo ${{env.GHCR_REPO}} | tr '[:upper:]' '[:lower:]')" >> ${GITHUB_ENV}
+
+      - name: Create and push multi-arch manifest
+        if: github.event_name != 'pull_request' && steps.changed-files.outputs.any_changed == 'true'
+        run: |
+          image=${{ env.GHCR_REPO_LC }}/clio-tools
+          docker buildx imagetools create \
+            -t $image:latest \
+            -t $image:${{ github.sha }} \
+            $image:arm64-latest \
+            $image:amd64-latest
+
   ci:
     name: Build and push CI docker image
     runs-on: heavy
-    needs: [gcc-merge, clang, tools]
+    needs: [gcc-merge, clang, tools-merge]
 
     steps:
       - uses: actions/checkout@v4