github: use self-hosted runner

Signed-off-by: Simon Deziel <simon.deziel@canonical.com>

.github/workflows/build.yml

@@ -1,26 +1,23 @@
 name: build
 
 on:
-  # Triggers the workflow on push or pull request events but only for the master branch
+  # Triggers the workflow on push or pull request events but only for the main branch
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
 jobs:
   build:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
+    runs-on:
+      - self-runnner
 
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v3
 
-      # shellcheck
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@master