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

@@ -25,7 +25,7 @@ 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 }}
 
@@ -37,8 +37,8 @@ jobs:
           provenance: false
           sbom: false
           tags: |
-            git.schweitz.internal/jpmschweitzer/tatlock:latest
-            git.schweitz.internal/jpmschweitzer/tatlock:${{ github.ref_name }}
+            git.schweitz.net/jpmschweitzer/tatlock:latest
+            git.schweitz.net/jpmschweitzer/tatlock:${{ github.ref_name }}
 
       - name: Trigger Watchtower update
         if: success()