chore: Update Docker registry URL format in CI workflow

### Summary of Changes
- Removed the trailing slash from the Docker registry URL in the CI workflow for `docker-build.yml` to ensure proper formatting.

### Expected Results
- Improved consistency in the Docker registry URL, potentially preventing issues during image builds and deployments.

.gitea/workflows/docker-build.yml

@@ -8,7 +8,7 @@ on:
     branches: [ main, develop ]
 
 env:
-  REGISTRY: https://gittea.kammenstraatha.duckdns.org/
+  REGISTRY: https://gittea.kammenstraatha.duckdns.org
   IMAGE_PREFIX: labfusion
 
 jobs: