ci: BrakemanをCIで実行するワークフローを追加

Author: nacchan99

.github/workflows/brakeman.yml

@@ -0,0 +1,25 @@
+name: Brakeman Security Scan
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  brakeman:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: .ruby-version
+          bundler-cache: true
+
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+
+      - name: Run Brakeman
+        run: bundle exec brakeman --exit-on-warn --quiet