Add Slither reentrancy check in CI (#3047)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

.github/workflows/test.yml

@@ -29,7 +29,7 @@ jobs:
         env:
           FORCE_COLOR: 1
           ENABLE_GAS_REPORT: true
-      - run: npm run test:inheritance 
+      - run: npm run test:inheritance
       - name: Print gas report
         run: cat gas-report.txt
 
@@ -54,3 +54,26 @@ jobs:
         env:
           NODE_OPTIONS: --max_old_space_size=4096
       - uses: codecov/codecov-action@v2
+
+  slither:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 12.x
+      - uses: actions/cache@v2
+        id: cache
+        with:
+          path: '**/node_modules'
+          key: npm-v2-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: npm-v2-
+      - run: npm ci
+        if: steps.cache.outputs.cache-hit != 'true'
+      - name: Set up Python
+        uses: actions/setup-python@v2
+
+      - name: Install dependencies
+        run: pip3 install slither-analyzer
+      - name: Summary of static analysis
+        run: npm run slither