ci/cd: check unicode in sail code

Signed-off-by: Maharshi Basu <[email protected]>

.github/workflows/unicode-check.yml

@@ -0,0 +1,22 @@
+name: Unicode check
+on:
+  pull_request:
+    branches:
+      - JSON
+  push:
+    branches:
+      - JSON
+
+jobs:
+  check-unicode:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Check for unicode in sail files
+        run: |
+          if git diff --exit-code --name-only ${{ github.base_ref }}..${{ github.head_ref }} | grep -E '\.sail$' | xargs grep -Pl "[\u2200-\u22FF]" --null --files-with-matches; then
+          echo "Error: Found unicode characters in Sail code"
+          exit 1
+          fi