fix(docker): use templates/replace-build-vars@v1

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.gitea/workflows/docker.yaml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Replace build placeholders
-        uses: https://git.custom-coding.net/UltimateCoder/resuable-workflows/actions/replace-build-vars@v3
+        uses: https://git.custom-coding.net/templates/replace-build-vars@v1
 
       - name: Build Image
         run: |