ci: use REGISTRY_USER/REGISTRY_TOKEN secrets

.gitea/workflows/build.yaml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Log in to Gitea Container Registry
         run: |
-          echo "${{ secrets.GITHUB_TOKEN }}" | docker login git.kubebase.de -u gitea --password-stdin
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login git.kubebase.de -u ${{ secrets.REGISTRY_USER }} --password-stdin
 
       - name: Build and push
         run: |
@@ -34,7 +34,7 @@ jobs:
 
       - name: Update k8s manifest in admin/apps
         env:
-          GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
           SHA=$(git rev-parse --short HEAD)
           git clone "https://admin:${GITEA_TOKEN}@git.kubebase.de/admin/apps.git" /tmp/apps