test: add shellcheck linting

.github/workflows/check.yml

@@ -1,4 +1,4 @@
-name: Workstation setup test
+name: Quality Checks
 run-name: ${{ github.workflow }} of commit ${{ github.sha }} on ${{ github.ref_name }} by ${{ github.actor }}
 
 on: [push]
@@ -12,6 +12,24 @@ defaults:
     shell: bash
 
 jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - id: ShellCheck
+        name: Differential ShellCheck
+        uses: redhat-plumbers-in-action/differential-shellcheck@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
   setup-and-test:
     name: Setup workstation and test
     strategy: