chore(ci): push images via git.schweitz.net registry

The .internal registry domain is being retired; git.schweitz.net now
serves the registry without SSO on /v2/.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Login to Gitea Registry
         uses: docker/login-action@v3
         with:
-          registry: git.schweitz.internal
+          registry: git.schweitz.net
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
@@ -36,8 +36,8 @@ jobs:
           context: .
           push: true
           tags: |
-            git.schweitz.internal/jpmschweitzer/core-api:latest
-            git.schweitz.internal/jpmschweitzer/core-api:${{ github.ref_name }}
+            git.schweitz.net/jpmschweitzer/core-api:latest
+            git.schweitz.net/jpmschweitzer/core-api:${{ github.ref_name }}
 
       - name: Trigger Watchtower update
         if: success()