ci: mirror beta pipeline for production publish

Rewrite publishDocker to build multi-arch (amd64+arm64) on push to main, push
by digest, and merge a manifest tagged :latest -- matching publishDockerBeta.
Publishes tecokit/edge-ml_dataset-storeatest. Replaces the legacy single-arch v1 build.

Author: hamza-aamer

.github/workflows/publishDocker.yml

@@ -1,21 +1,82 @@
-name: Publish Docker
-
+name: Publish Docker - main
 on:
   push:
     branches:
       - main
 
+env:
+  IMAGE: tecokit/edge-ml_dataset-store
+
 jobs:
-  push_to_registry:
-    name: Push Docker image to Docker Hub
+  build:
+    name: Build (${{ matrix.platform }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+    steps:
+      - name: Prepare platform pair
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> "$GITHUB_ENV"
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
+      - name: Export digest
+        run: |
+          mkdir -p "${{ runner.temp }}/digests"
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: ${{ runner.temp }}/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Merge manifest and push
     runs-on: ubuntu-latest
+    needs:
+      - build
     steps:
-      - name: Check out the repo
-        uses: actions/checkout@v2
-      - name: Push to Docker Hub
-        uses: docker/build-push-action@v1
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: digests-*
+          merge-multiple: true
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: tecokit/dataset-store
-          tag_with_ref: true
+      - name: Create manifest list and push
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          docker buildx imagetools create -t "${{ env.IMAGE }}:latest" \
+            $(printf '${{ env.IMAGE }}@sha256:%s ' *)
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect "${{ env.IMAGE }}:latest"