ci(codecov): Add codecov and upload test coverage (#34)

.github/workflows/codecov.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    types: [opened, synchronize, reopened]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  codecov:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: corepack enable
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: 'yarn'
+      - run: yarn install
+      - run: yarn test
+      - uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

codecov.yml

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+coverage:
+  status:
+    patch: off
+    project:
+      default:
+        target: 100%
+        threshold: 10%
+
+comment:
+  layout: 'header, reach, diff, flags, components'
+
+ignore:
+  - '**/*.test-d.*'