ci: add job for shfmt and shellcheck linting

Author: 3w36zj6

.github/workflows/ci.yaml

@@ -36,6 +36,27 @@ jobs:
       - name: ${{ matrix.name }}
         run: ${{ matrix.command }}
 
+  ci-shell:
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - task: shfmt
+            name: "Run shfmt"
+            command: "shfmt -d ."
+          - task: shellcheck
+            name: "Run shellcheck"
+            command: "shellcheck **/*.sh"
+    name: Run ${{ matrix.task }}
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Setup tools
+        uses: jdx/mise-action@13abe502c30c1559a5c37dff303831bab82c9402 # v2.2.3
+      - name: ${{ matrix.name }}
+        run: ${{ matrix.command }}
+
   build:
     runs-on: ubuntu-24.04
     strategy: