ci: update workflows to use local-ubuntu-latest runner

- Changed ci.yaml from ubuntu-latest to local-ubuntu-latest
- Changed release.yaml from ubuntu-latest to local-ubuntu-latest
- e2e.yaml already using k3s-animaniacs (correct)

This ensures all CI jobs run on on-prem runners instead of GitHub-hosted runners.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   lint-and-test:
-    runs-on: ubuntu-latest
+    runs-on: local-ubuntu-latest
     timeout-minutes: 10
 
     steps:

.github/workflows/release.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   release:
-    runs-on: ubuntu-latest
+    runs-on: local-ubuntu-latest
     permissions:
       contents: write
       packages: write