fix(ci): use runs-on: ubuntu-latest (non-empty) for Gitea Actions v5

.gitea/workflows/ci.yaml

@@ -13,7 +13,7 @@ env:
 
 jobs:
   check:
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -44,7 +44,7 @@ jobs:
 
   tests-unit:
     needs: check
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -72,7 +72,7 @@ jobs:
 
   tests-integration:
     needs: check
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -88,7 +88,7 @@ jobs:
 
   tests-ui:
     needs: check
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -119,7 +119,7 @@ jobs:
   preflight:
     needs: [tests-unit, tests-integration, tests-ui]
     if: gitea.event_name == 'pull_request' || (gitea.event_name == 'push' && startsWith(gitea.ref, 'refs/heads/codex/'))
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -148,7 +148,7 @@ jobs:
   deploy:
     needs: [tests-unit, tests-integration, tests-ui]
     if: gitea.event_name == 'push' && (gitea.ref_name == 'main' || gitea.ref_name == 'master')
-    runs-on: []
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v5

src/lib/ci-workflow-contract.test.ts

@@ -34,12 +34,12 @@ describe("CI workflow", () => {
 			workflow.indexOf("check:"),
 			workflow.indexOf("\n  deploy:"),
 		);
-		expect(checkJob).toContain("runs-on: []");
+		expect(checkJob).toContain("runs-on: ubuntu-latest");
 	});
 
 	it("deploy job runs on host runner", () => {
 		const deployJob = workflow.slice(workflow.indexOf("\n  deploy:"));
-		expect(deployJob).toContain("runs-on: []");
+		expect(deployJob).toContain("runs-on: ubuntu-latest");
 	});
 
 	it("check includes toolchain check", () => {