ci: split linter and build jobs

.github/workflows/main.yml

@@ -1,5 +1,3 @@
-# This is a basic workflow to help you get started with Actions
-
 name: CI
 
 # Controls when the action will run.
@@ -15,21 +13,25 @@ on:
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
+  lint:
     runs-on: ubuntu-latest
-
-    # 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@v2
+        with:
+          fetch-depth: 0
 
-      - name: Lint
+      - name: Pylint
         uses: cclauss/GitHub-Action-for-pylint@master
         with:
           args: "pylint src/vcs/"
 
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
       - name: Install dependencies
         run: sudo apt-get -y install appstream appstream-util desktop-file-utils gettext