fix(ci): use linux-latest instead of ubuntu-latest for runners

Our runners have linux-latest label, not ubuntu-latest.

🤖 Generated with Claude Code

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

.gitea/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
   # Lint job - must pass
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -54,7 +54,7 @@ jobs:
   # Unit tests with SQLite (no external database needed)
   test-unit:
     name: Unit Tests
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -81,7 +81,7 @@ jobs:
   # Integration tests with PostgreSQL
   test-pgsql:
     name: Integration Tests (PostgreSQL)
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     services:
       pgsql:
         image: postgres:15
@@ -154,7 +154,7 @@ jobs:
   # Create release job - runs first to create the release before build jobs upload
   create-release:
     name: Create Release
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     if: startsWith(github.ref, 'refs/tags/v')
     outputs:
       release_id: ${{ steps.create.outputs.release_id }}
@@ -197,7 +197,7 @@ jobs:
   # Build job for binaries
   build:
     name: Build Binaries
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     needs: [lint, create-release]
     if: always() && needs.lint.result == 'success' && (needs.create-release.result == 'success' || needs.create-release.result == 'skipped')
     strategy: