CI: GitHyb: add HLint

.github/workflows/HLint.yml

@@ -0,0 +1,25 @@
+name: "Checking code"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build10:
+    name: "HLint"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: 'Installing'
+      uses: rwe/actions-hlint-setup@v1
+      with:
+        version: '3.3.1'
+
+    - name: 'Checking code'
+      uses: rwe/actions-hlint-run@v1
+      with:
+        path: .
+        fail-on: warning