init

.gitea/workflows/build-sign-push.yaml

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+# .gitea/workflows/build-sign-push.yaml
+name: build, sign and push
+
+on:
+  push:
+    branches: [main]
+
+env:
+  REGISTRY: git.realmanual.ru
+  IMAGE: git.realmanual.ru/${{ gitea.repository }}
+
+jobs:
+  build-and-sign:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      # --- build ---
+      - name: set up docker buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Read Version
+        id: version
+        run: echo "VERSION=$(cat image/VERSION)" >> $GITHUB_OUTPUT                
+      - name: login to registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.PUSH_TOKEN }}
+
+      - name: build and push
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: ./image
+          push: true
+          # тегируем и по SHA и по latest
+          tags: |
+            ${{ env.IMAGE }}:${{ gitea.sha }}
+            ${{ env.IMAGE }}:${{ steps.version.outputs.VERSION }}
+          # digest понадобится для подписи — по тегу подписывать нельзя
+          outputs: type=image,push=true
+
+      # --- sign ---
+      # cosign надо ставить отдельно — в ubuntu-latest его нет
+      - name: install cosign
+        uses: sigstore/cosign-installer@v3
+        with:
+          cosign-release: 'v3.0.5'
+
+      - name: sign image
+        env:
+          COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
+          COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
+          # digest в формате sha256:abc123...
+          IMAGE_DIGEST: ${{ steps.build.outputs.digest }}
+        run: |
+          cosign sign --yes \
+            --key env://COSIGN_PRIVATE_KEY \
+            ${{ env.IMAGE }}@${IMAGE_DIGEST}
+
+      # --- verify (self-check в CI) ---
+      - name: verify signature
+        env:
+          IMAGE_DIGEST: ${{ steps.build.outputs.digest }}
+        run: |
+          cosign verify \
+            --key cosign.pub \
+            ${{ env.IMAGE }}@${IMAGE_DIGEST}