add test coverage and codecov action to workflows

.github/workflows/codecov.yml

@@ -0,0 +1,30 @@
+name: Code Coverage
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  code-cov:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout and clone repo
+        uses: actions/checkout@v4.1.1
+      - name: Install dependencies
+        run: npm install
+      - name: Setup PostgreSQL
+        uses: Harmon758/postgresql-action@v1.0.0
+        with:
+          postgresql db: nc_news_test
+          postgresql user: test_user
+          postgresql password: password
+      - name: Run complete test suite
+        run: PGDATABASE=nc_news_test PGUSER=test_user PGPASSWORD=password npm run test
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -1,2 +1,3 @@
 node_modules
-.env.*
+.env.*
+/coverage

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "setup-dbs": "psql -f ./db/setup.sql",
     "seed": "node ./db/seeds/run-seed.js",
-    "test": "TZ=UTC jest",
+    "test": "TZ=UTC jest --coverage",
     "dev": "TZ=UTC node listen.js",
     "prepare": "husky install",
     "start": "node listen.js",