style(compiler): c++ formatting with github action (#22)

* style(compiler): c++ formatting with github action

* style(compiler): update format script

.github/workflows/conformance.yml

@@ -0,0 +1,18 @@
+name: Conformance
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  Formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Format with clang-format
+        run: .github/workflows/scripts/format_cpp.sh
+

.github/workflows/scripts/format_cpp.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -o pipefail
+
+find ./compiler/{include,lib,src}  \( -iname "*.h" -o -iname "*.cpp" -o -iname "*.cc" \) | xargs clang-format -i -style='file'
+if [ $? -ne 0 ]
+then
+    exit 1
+fi
+
+# show changes if any
+git diff
+# fail if there is a diff, success otherwise
+! ( git diff |  grep -q ^ ) || exit 1