ci: add code coverage reporting for codecov

Signed-off-by: simonsan <14062932+simonsan@users.noreply.github.com>

.github/workflows/coverage.yaml

@@ -0,0 +1,24 @@
+name: Test Coverage
+
+on: [push]
+jobs:
+  test:
+    name: generate coverage report
+    runs-on: ubuntu-latest
+    container:
+      image: xd009642/tarpaulin:develop-nightly
+      options: --security-opt seccomp=unconfined
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4.1.1
+
+      - name: Generate code coverage
+        run: |
+          cargo +nightly tarpaulin --verbose --all-features --workspace --timeout 120 --out xml
+      
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4.1.0
+        with:
+            token: ${{ secrets.CODECOV_TOKEN }}
+            slug: pace-rs/pace
+            fail_ci_if_error: true