[refactor] consolidate Docker image build workflows into a single file

.github/workflows/build-images.yml

@@ -2,88 +2,88 @@ name: Build and publish Docker images for Energy Tracker
 
 on:
   push:
-    branches: [ "staging" ]
+    branches: [ "staging", "main" ]
+  pull_request:
+    branches: [ "staging", "main" ]
 
 env:
   REGISTRY: ghcr.io
   PROVER_IMAGE_NAME: ${{ github.repository }}
   STREAMR_IMAGE_NAME: ${{ github.repository }}/streamr-client
 
-
 jobs:
-  build-and-push-prover-image:
+  build-and-push-images:
     runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
       attestations: write
       id-token: write
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5
-      - name: Log in to the Container registry
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+
+      # Build and push Prover image (energy-tracker)
+      - name: Extract metadata for Prover image
+        id: meta-prover
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.PROVER_IMAGE_NAME }}
-      - name: Build and push Docker image
-        id: push
-        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+
+      - name: Build and push Prover image
+        uses: docker/build-push-action@v6
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-      - name: Generate artifact attestation
+          tags: ${{ steps.meta-prover.outputs.tags }}
+          labels: ${{ steps.meta-prover.outputs.labels }}
+
+      - name: Generate attestation for Prover image
         if: github.event_name != 'pull_request'
         uses: actions/attest-build-provenance@v3
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.PROVER_IMAGE_NAME }}
-          subject-digest: ${{ steps.push.outputs.digest }}
+          subject-digest: ${{ steps.build-and-push-prover.outputs.digest }}
           push-to-registry: true
 
-  build-and-push-streamr-image:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-      attestations: write
-      id-token: write
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v5
-      - name: Log in to the Container registry
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+      # Build and push Streamr client image
+      - name: Extract metadata for Streamr client image
+        id: meta-streamr
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.STREAMR_IMAGE_NAME }}
-      - name: Build and push Docker image
-        id: push
-        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+
+      - name: Build and push Streamr client image
+        uses: docker/build-push-action@v6
         with:
           context: ./streamr-client
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-      
-      - name: Generate artifact attestation
+          tags: ${{ steps.meta-streamr.outputs.tags }}
+          labels: ${{ steps.meta-streamr.outputs.labels }}
+
+      - name: Generate attestation for Streamr client image
         if: github.event_name != 'pull_request'
         uses: actions/attest-build-provenance@v3
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.STREAMR_IMAGE_NAME }}
-          subject-digest: ${{ steps.push.outputs.digest }}
-          push-to-registry: true
+          subject-digest: ${{ steps.build-and-push-streamr.outputs.digest }}
+          push-to-registry: true