Re-added clang-format checks to the CI

.github/workflows/ci.yml

@@ -124,3 +124,18 @@ jobs:
           name: godot-cpp-macos-x86_64-release
           path: bin/libgodot-cpp.osx.release.64.a
           if-no-files-found: error
+
+  static-checks:
+    name: Static Checks (clang-format)
+    runs-on: ubuntu-16.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.3.4
+    
+      - name: Install dependencies
+        run: |
+          sudo apt-get install clang-format-8
+
+      - name: Style checks via clang-format
+        run: |
+          bash ./misc/scripts/clang_format.sh