Rename main.yml to pull_request.yml, add push.yml

Lintly-Flake8 only works for PRs, so I had to split
the workflows into 2 different files. I also added
the secrets.GITHUB_TOKEN because that might be needed
based on the action's documentation

Author: phrdang

.github/workflows/main.yml renamed to .github/workflows/pull_request.yml

@@ -1,8 +1,7 @@
-name: Python Style
+# Uses https://github.com/marketplace/actions/lintly-flake8?version=v1.0
+name: Python Style (PR)
 
 on:
-  push:
-    branches: [ master ]
   pull_request:
     branches: [ master ]
 
@@ -16,9 +15,8 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: '3.x'
-      # - name: Lint with flake8
-      #   run: |
-      #     pip install flake8
-      #     flake8 .
       - name: Lintly-Flake8
-        uses: grantmcconnaughey/lintly-flake8-github-action@v1.0
+        uses: grantmcconnaughey/lintly-flake8-github-action@v1.0
+        with:
+          # The GitHub API token to create reviews with
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/push.yml

@@ -0,0 +1,20 @@
+name: Python Style (Push)
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  check-style:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+      - name: Lint with flake8
+        run: |
+          pip install flake8
+          flake8 .