Add GitHub Actions file health workflow

.github/workflows/file_health.yaml

@@ -0,0 +1,27 @@
+name: GitHub Actions file health check
+
+on:
+  push:
+    branches: [ '**' ]
+  pull_request:
+    types: [edited, opened, reopened, synchronize]
+    branches: [ '**' ]
+
+jobs:
+  check_file_health:
+    name: Check file health
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: checkout repository
+      uses: actions/checkout@v2.3.3
+
+    - name: install zsh
+      run: |
+        sudo apt update
+        sudo apt install zsh
+
+    - name: run check file health script
+      run: |
+        ./.github/workflows/file_health.sh