ci: split to parallel stages

.github/workflows/main.yml

@@ -12,16 +12,25 @@ 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
+  pre-commit:
     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
     - name: pre-commit
       uses: pre-commit/action@v1.1.0
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
     - name: Hadolint Action
       uses: brpaz/hadolint-action@v1.1.0
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the tagged Docker image
+      run: docker build .