[c] use absolute URLs for actions

.forgejo/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
           token: ${{ secrets.FORGEJO_TOKEN }}
 
       - name: 👤 Log in to the Container registry
-        uses: github.com/docker/login-action@v2
+        uses: https://github.com/docker/login-action@v2
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ gitea.actor }}
@@ -34,7 +34,7 @@ jobs:
 
       - name: ✏️ Extract metadata (tags, labels) for Docker
         id: meta
-        uses: github.com/docker/metadata-action@v4
+        uses: https://github.com/docker/metadata-action@v4
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
@@ -46,7 +46,7 @@ jobs:
             type=sha
 
       - name: 🛠️ Build and push Docker image
-        uses: github.com/docker/build-push-action@v4
+        uses: https://github.com/docker/build-push-action@v4
         with:
           context: .
           push: true