🧪 add test coverage job (#94)

Related: #57

.github/workflows/build.yml

@@ -10,6 +10,28 @@ on:
   workflow_dispatch:
 
 jobs:
+  build_and_test:
+    name: Run tests and collect coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests
+        run: npx jest --coverage
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
   push_to_registry:
     name: Push Docker image to Docker Hub
     runs-on: ubuntu-latest

README.md

@@ -6,7 +6,7 @@
 
 Groups (currently Azure Active Directory Only) to GitHub Teams sync
 
-[![CodeQL](https://github.com/cloudpups/github-teams-user-sync/actions/workflows/codeql.yml/badge.svg)](https://github.com/cloudpups/github-teams-user-sync/actions/workflows/codeql.yml) [![Docker Pulls](https://img.shields.io/docker/pulls/trfc/github-teams-user-sync)](https://hub.docker.com/r/trfc/github-teams-user-sync) [![CodeFactor](https://www.codefactor.io/repository/github/cloudpups/github-teams-user-sync/badge)](https://www.codefactor.io/repository/github/cloudpups/github-teams-user-sync)
+[![CodeQL](https://github.com/cloudpups/github-teams-user-sync/actions/workflows/codeql.yml/badge.svg)](https://github.com/cloudpups/github-teams-user-sync/actions/workflows/codeql.yml) [![Docker Pulls](https://img.shields.io/docker/pulls/trfc/github-teams-user-sync)](https://hub.docker.com/r/trfc/github-teams-user-sync) [![CodeFactor](https://www.codefactor.io/repository/github/cloudpups/github-teams-user-sync/badge)](https://www.codefactor.io/repository/github/cloudpups/github-teams-user-sync) [![codecov](https://codecov.io/gh/cloudpups/github-teams-user-sync/graph/badge.svg?token=CS2EM7ZITZ)](https://codecov.io/gh/cloudpups/github-teams-user-sync)
 
 Before submitting a new Feature request, please check existing open and closed Issues