Test adding coveralls (mirrors existing test)

.github/workflows/coverage.yml

@@ -0,0 +1,30 @@
+name: Coverage
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  RUST_BACKTRACE: 1
+
+jobs:
+  coverage:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          target/
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: coverage
+      run: cargo tarpaulin --engine llvm --follow-exec --post-test-delay 10 --coveralls ${{ secrets.COVERALLS_REPO_TOKEN }} --features=openblas