Add github action to validate build manifest

.github/workflows/manifest.yml

@@ -0,0 +1,21 @@
+name: manifest_validation
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.9
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Validating manifest
+      run: ./scripts/validate_manifest.py validate --path=./conf/build.manifest