ci: use dedicated registry token when configured

.gitea/workflows/container.yml

@@ -54,10 +54,14 @@ jobs:
       - name: Log in to Gitea registry
         shell: bash
         env:
-          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
           set -euo pipefail
-          echo "${GITEA_TOKEN}" | docker login git.wimby.cz --username "${GITHUB_ACTOR}" --password-stdin
+          if [ -z "${REGISTRY_TOKEN:-}" ]; then
+            echo "REGISTRY_TOKEN is not configured; image will build but publishing is skipped."
+            exit 0
+          fi
+          echo "${REGISTRY_TOKEN}" | docker login git.wimby.cz --username wimby --password-stdin
 
       - name: Build image
         shell: bash
@@ -75,8 +79,14 @@ jobs:
 
       - name: Push image
         shell: bash
+        env:
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
           set -euo pipefail
+          if [ -z "${REGISTRY_TOKEN:-}" ]; then
+            echo "REGISTRY_TOKEN is not configured; skipping publish."
+            exit 0
+          fi
           short_sha="${GITHUB_SHA:0:12}"
           docker push "git.wimby.cz/wimby/tubesync:${short_sha}"
           docker push "git.wimby.cz/wimby/tubesync:latest"