[c] fix docker login

.forgejo/workflows/build.yml

@@ -26,11 +26,9 @@ jobs:
           token: ${{ secrets.FORGEJO_TOKEN }}
 
       - name: 👤 Log in to the Container registry
-        uses: https://github.com/docker/login-action@v2
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ gitea.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+        id: login
+        run: |
+          echo "${{ secrets.FORGEJO_TOKEN }}" | docker login gitpot.org -u ${{ gitea.actor }} --password-stdin
 
       - name: ✏️ Extract metadata (tags, labels) for Docker
         id: meta