ci: use built-in GITHUB_TOKEN, fix registry URL

.gitea/workflows/build.yaml

@@ -22,19 +22,19 @@ jobs:
 
       - name: Log in to Gitea Container Registry
         run: |
-          echo "${{ secrets.GITEA_TOKEN }}" | docker login ${{ gitea.server_url }} -u ${{ secrets.GITEA_USER }} --password-stdin
+          echo "${{ secrets.GITHUB_TOKEN }}" | docker login git.kubebase.de -u gitea --password-stdin
 
       - name: Build and push
         run: |
           SHA=$(git rev-parse --short HEAD)
-          IMAGE="${{ gitea.server_url }}/${{ gitea.repository }}"
+          IMAGE="git.kubebase.de/${{ gitea.repository }}"
           docker build -t "${IMAGE}:sha-${SHA}" -t "${IMAGE}:latest" .
           docker push "${IMAGE}:sha-${SHA}"
           docker push "${IMAGE}:latest"
 
       - name: Update k8s manifest in admin/apps
         env:
-          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           SHA=$(git rev-parse --short HEAD)
           git clone "https://admin:${GITEA_TOKEN}@git.kubebase.de/admin/apps.git" /tmp/apps