ci: enable static analysis and shellcheck workflows

Author: mariomeyer

.github/workflows/shellcheck.yml

@@ -0,0 +1,23 @@
+name: Differential ShellCheck
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Repository checkout
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Differential ShellCheck
+        uses: redhat-plumbers-in-action/differential-shellcheck@v5
+        with:
+          severity: warning
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/static-analysis.yml

@@ -0,0 +1,15 @@
+name: static analysis
+
+on:
+  push:
+    branches:
+      - master
+      - '*.x'
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    uses: laravel/.github/.github/workflows/static-analysis.yml@main