feat: add semgrep security issues scanning

.github/workflows/run-semgrep.yaml

@@ -0,0 +1,39 @@
+name: Run Semgrep
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - '**.sol'
+  pull_request:
+    paths:
+      - '**.sol'
+
+jobs:
+  semgrep:
+    name: Scan
+    runs-on: ubuntu-latest
+
+    container:
+      image: returntocorp/semgrep
+
+    if: (github.actor != 'dependabot[bot]')
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Fetch semgrep rules
+        uses: actions/checkout@v3
+        with:
+          repository: decurity/semgrep-smart-contracts
+          path: rules
+
+      - run: semgrep ci --sarif --output=semgrep.sarif --include packages/contracts/src/dollar --no-suppress-errors
+        env:
+          SEMGREP_RULES: rules/solidity/security
+
+      - name: Upload findings to GitHub Advanced Security Dashboard
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: semgrep.sarif
+        if: always()

.semgrepignore

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+# mocks
+packages/contracts/src/dollar/mocks/
+
+# deprecated contracts
+packages/contracts/src/dollar/core/CreditNft.sol
+packages/contracts/src/dollar/core/StakingShare.sol
+packages/contracts/src/dollar/libraries/LibCreditNftManager.sol
+packages/contracts/src/dollar/libraries/LibDollarMintExcess.sol