Merge pull request #30 from Slamdunk/shellcheck

Add ShellCheck to CI

Author: weierophinney

.github/workflows/shellcheck.yml

@@ -0,0 +1,22 @@
+name: "ShellCheck"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - '[0-9]+.[0-9]+.x'
+      - 'refs/pull/*'
+    tags:
+
+jobs:
+  shellcheck:
+    name: "ShellCheck"
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Run ShellCheck"
+        uses: "reviewdog/action-shellcheck@v1"
+        with:
+          fail_on_error: true