Add CI checks for file formatting and style checks

.github/workflows/static_checks.yml

@@ -0,0 +1,30 @@
+name: 📊 Static Checks
+on: [push, pull_request]
+
+jobs:
+  static-checks:
+    name: Static Checks (black format, file format)
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Azure repositories are not reliable, we need to prevent Azure giving us packages.
+      - name: Make apt sources.list use the default Ubuntu repositories
+        run: |
+          sudo rm -f /etc/apt/sources.list.d/*
+          sudo cp -f misc/ci/sources.list /etc/apt/sources.list
+          sudo apt-get update
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get install -qq dos2unix recode
+          sudo pip3 install black==20.8b1
+
+      - name: File formatting checks (file_format.sh)
+        run: |
+          bash ./misc/scripts/file_format.sh
+
+      - name: Python style checks via black (black_format.sh)
+        run: |
+          bash ./misc/scripts/black_format.sh