add coverage flow

.github/workflows/coverage.yml

@@ -0,0 +1,32 @@
+name: Code Coverage
+
+on:
+  pull_request:
+
+jobs:
+  test-and-coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the code
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.22'
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run tests with coverage
+        run: |
+          mkdir -p coverage
+          go test -v -coverpkg=./... -coverprofile=coverage/coverage.out -covermode=atomic ./...
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          files: ./coverage/coverage.out
+          flags: cosmos
+          fail_ci_if_error: true