Build multi-arch images in CI with native amd64 and arm64 runners

.gitea/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: amd64
     steps:
       - uses: actions/checkout@v4
 
@@ -31,9 +31,15 @@ jobs:
       - name: Testy
         run: poetry run pytest -q
 
-  build-and-push:
+  # Každá architektura se staví NATIVNĚ na vlastním runneru (label = architektura):
+  #   amd64 -> srv2-amd64-runner (SRV2), arm64 -> srv1-arm64-runner (SRV1, RPi 4).
+  # Žádná emulace (QEMU). Každý běh pushne image s příponou architektury.
+  build:
     needs: test
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        arch: [amd64, arm64]
+    runs-on: ${{ matrix.arch }}
     steps:
       - uses: actions/checkout@v4
 
@@ -57,10 +63,42 @@ jobs:
           echo '${{ secrets.REGISTRY_TOKEN }}' \
             | docker login gitea.doubynet.eu -u '${{ github.actor }}' --password-stdin
 
-      - name: Build image
-        run: docker build -t "$IMAGE:$MOVING_TAG" -t "$IMAGE:${{ github.sha }}" .
-
-      - name: Push image
+      - name: Build image (${{ matrix.arch }})
         run: |
-          docker push "$IMAGE:$MOVING_TAG"
-          docker push "$IMAGE:${{ github.sha }}"
+          docker build \
+            -t "$IMAGE:$MOVING_TAG-${{ matrix.arch }}" \
+            -t "$IMAGE:${{ github.sha }}-${{ matrix.arch }}" .
+
+      - name: Push image (${{ matrix.arch }})
+        run: |
+          docker push "$IMAGE:$MOVING_TAG-${{ matrix.arch }}"
+          docker push "$IMAGE:${{ github.sha }}-${{ matrix.arch }}"
+
+  # Spojí obě architektury pod jedno jméno tagu. `docker pull ...:devel` pak na
+  # amd64 i arm64 stroji sám vybere správnou variantu.
+  manifest:
+    needs: build
+    runs-on: amd64
+    steps:
+      - name: Název image a značka
+        run: |
+          echo "IMAGE=gitea.doubynet.eu/$(echo '${{ github.repository }}' \
+            | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_ENV"
+          if [ "${{ github.ref_name }}" = "release" ]; then
+            echo "MOVING_TAG=latest" >> "$GITHUB_ENV"
+          else
+            echo "MOVING_TAG=devel" >> "$GITHUB_ENV"
+          fi
+
+      - name: Přihlášení do Gitea registry
+        run: |
+          echo '${{ secrets.REGISTRY_TOKEN }}' \
+            | docker login gitea.doubynet.eu -u '${{ github.actor }}' --password-stdin
+
+      - name: Multi-arch manifest (moving tag + commit SHA)
+        run: |
+          for TAG in "$MOVING_TAG" "${{ github.sha }}"; do
+            docker manifest create --amend "$IMAGE:$TAG" \
+              "$IMAGE:$TAG-amd64" "$IMAGE:$TAG-arm64"
+            docker manifest push "$IMAGE:$TAG"
+          done