fix(ci): Use Docker-labeled runner for all CI/CD jobs

Updated all jobs in the lint-and-build workflow to use the
Docker-labeled runner instead of ubuntu-latest.

Changes:
- lint job: runs-on: docker
- build job: runs-on: docker
- docker-build job: runs-on: docker

Benefits:
- Native Docker support
- Faster builds
- Better performance on local infrastructure
- Consistent with server setup

.forgejo/workflows/lint-and-build.yml

@@ -17,7 +17,7 @@ env:
 jobs:
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: docker
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -60,7 +60,7 @@ jobs:
 
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: docker
     needs: lint
     steps:
       - name: Checkout code
@@ -103,7 +103,7 @@ jobs:
 
   docker-build:
     name: Docker Build
-    runs-on: ubuntu-latest
+    runs-on: docker
     needs: build
     steps:
       - name: Checkout code