Add environment variable for registry in release workflow

- Introduced an environment variable 'REGISTRY' set to 'ghcr.io' in the release.yml workflow to standardize the container registry used during the build and release process.

Author: gmD3v

.github/workflows/release.yml

@@ -5,6 +5,9 @@ on:
     tags:
       - 'v*' 
 
+env:
+    REGISTRY: ghcr.io
+
 jobs:
   build-and-release:
     runs-on: ubuntu-latest