Create slither.yml

adding slither

Author: inigo-rootstocklabs

.github/workflows/slither.yml

@@ -0,0 +1,36 @@
+name: Slither Analysis
+on: [push]
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run Slither
+        uses: crytic/slither-action@v0.3.0
+        id: slither
+        with:
+          node-version: 16
+          fail-on: none
+          slither-args: --filter-paths "openzeppelin,RIF,util" --exclude .github --checklist --markdown-root ${{ github.server_url }}/${{ github.repository }}/blob/${{ github.sha }}/
+          target: .
+
+      - name: Create Slack payload
+        id: create-slack-payload
+        run: |
+             npm install -g md-to-pdf
+             touch slither-output.md   
+             echo -n '${{steps.slither.outputs.stdout }}' > slither-output.md
+             md-to-pdf slither-output.md > slither-output.pdf
+             
+             
+      - uses: MeilCli/slack-upload-file@v3
+        with:
+          slack_token: ${{ secrets.SLACK_TOKEN }}
+          channel_id: 'C05UBKD9Y65'
+          file_path: 'slither-output.pdf'
+          initial_comment: 'Slither scan results for ${{github.repository}}'
+