several changes

.gitea/workflows/build.yml

@@ -51,14 +51,17 @@ jobs:
           fi
 
       - name: Checkout
-        uses: actions/checkout@v6
+        # v6.0.3 - Verhindert Klon-Fehler im act_runner
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v6.0.3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
+        # v4.0.1
+        uses: docker/setup-buildx-action@b5ba51281db4430f3465b52478a8b18538ca9468 # v4.0.1
 
       - name: Image Metadata
         id: metadata
-        uses: docker/metadata-action@v6
+        # v6.1.0
+        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v6.1.0
         with:
           images: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
@@ -81,14 +84,16 @@ jobs:
 
       - name: Login to Gitea Container Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v4
+        # v4.0.0
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v4.0.0
         with:
           registry: ${{ env.REGISTRY_HOST }}
           username: ${{ github.repository_owner }}
           password: ${{ secrets.REGISTRY }}
 
       - name: Build and Push Image (Native OCI via Buildx)
-        uses: docker/build-push-action@v7
+        # v7.1.0
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v7.1.0
         id: build_image
         with:
           context: .
@@ -97,23 +102,27 @@ jobs:
           tags: ${{ steps.metadata.outputs.tags }}
           labels: ${{ steps.metadata.outputs.labels }}
 
+      - name: Install Cosign
+        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
+        # Vollständig gehärteter SHA für cosign-installer v4.1.2
+        uses: sigstore/cosign-installer@6f9f177c9960530e461b6c7ed1eec3f02e8e3605 # v4.1.2
+
       - name: Sign container image
         if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
-        uses: sigstore/cosign-sign-action@v3.1.1
-        with:
-          # Bild-Referenz ohne Tag, da die Action den Digest oder Tag separat trennt
-          image-repository: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
-          image-tag: ${{ env.IMAGE_TAG }}
+        env:
+          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
+          COSIGN_PASSWORD: ""
+        run: |
+          # WICHTIG: Cosign v3 benötigt zwingend den exakten Image-Digest, wenn OCI-Referrers im Spiel sind.
+          # Wir holen uns den Digest direkt aus dem Output des Buildx-Schritts.
+          IMAGE_DIGEST="${{ steps.build_image.outputs.digest }}"
+          IMAGE_REF="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${IMAGE_DIGEST}"
 
-          # Authentifizierung für deine Gitea-Registry (wichtig, damit die Action das Image pushen darf)
-          registry-username: ${{ github.repository_owner }}
-          registry-password: ${{ secrets.REGISTRY }}
-
-          # Deine Keys aus den Secrets geladen
-          cosign-private-key: ${{ secrets.SIGNING_SECRET }}
-          cosign-password: ""
-
-          # Deine spezifischen Flags für den Gitea/bootc Legacy-Bypass:
-          registry-referrers-api: 'legacy'
-          cosign-tlog-upload: 'false'
-          use-signing-config: 'false'
+          echo "Signiere Image via Digest: ${IMAGE_REF}"
+          cosign sign -y \
+            --key env://COSIGN_PRIVATE_KEY \
+            --use-signing-config=false \
+            --new-bundle-format=false \
+            --tlog-upload=false \
+            --registry-referrers-mode=legacy \
+            "${IMAGE_REF}"