Add initial implementation of PolinRider malware scanner

- Introduced core files including Dockerfile, action.yml, and entry point script (bin/polinrider.js) for the PolinRider malware scanner.
- Created configuration files: .env.example, .gitignore, and .npmrc for environment setup and dependency management.
- Added CI workflows for testing, building, and releasing the action, along with examples for usage in GitHub Actions.
- Implemented a README.md to provide documentation on usage, features, and setup instructions.
- Included necessary scripts for building the action and handling security measures during execution.
- Established a structured directory for reports and workspace management within Docker.
- Ensured all files are set up for a secure and efficient scanning process of GitHub repositories for PolinRider malware.

examples/fix-on-push.yml

@@ -0,0 +1,21 @@
+# Auto-clean pushes to the default branch and commit the fix back.
+# commit-back works on push events (not pull_request — see README). Pushes made
+# with the default GITHUB_TOKEN do NOT retrigger workflows, so there's no loop.
+name: PolinRider auto-clean
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: write # required to commit the cleanup back
+
+jobs:
+  clean:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: RMSoft-ltd/polinrider-cleanup@v1
+        with:
+          mode: fix
+          commit: true
+          token: ${{ secrets.GITHUB_TOKEN }}