Coverity scan (#454)

* coverity scan workflow

* on push to main

.github/workflows/coverity.yml

@@ -0,0 +1,18 @@
+name: Coverity Scan
+
+on:
+  push:
+    branches: [main]
+jobs:
+  coverity:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: git ls-files > git-ls-files.lst
+      - uses: vapier/coverity-scan-action@v1
+        with:
+          project: sigopt-python
+          email: ${{ secrets.COVERITY_SCAN_EMAIL }}
+          token: ${{ secrets.COVERITY_SCAN_TOKEN }}
+          build_language: other
+          command: "--no-command --fs-capture-list git-ls-files.lst"