feat: add separate jobs

.github/workflows/hello_world.yml

@@ -1,14 +1,11 @@
-name: Hello World
+name: Flake Eight
 
 on: [push]
 
 jobs:
-  hello:
+  install-deps:
     runs-on: ubuntu-latest
     steps:
-    - name: Greeting
-      run: echo "Hello great big World!"
-
     - name: Checkout repository
       uses: actions/checkout@v2
 
@@ -25,8 +22,16 @@ jobs:
     - name: Install flake8
       run: pip install flake8
 
+  linting:
+    runs-on: ubuntu-latest
+    needs: install-deps
+    steps:
     - name: Run flake8
       run: flake8 src/ tests/
 
+  tests:
+    runs-on: ubuntu-latest
+    needs: install-deps
+    steps:
     - name: Run tests
       run: pytest tests/