ci: fix build.yaml

.gitea/workflows/build.yaml

@@ -20,7 +20,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+
       - name: Login to Gitea registry
+        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login -u ${{ github.actor }} --password-stdin gitea.home.hrajfrisbee.cz
+
       - name: Build and push
         run: |
           TAG=${{ github.ref_name }}