CI: GitHub actions workflow for tests

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: Prebid.js CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request_target:
+    branches:
+      - master    
+
+jobs:
+  setup:
+    name: Setup
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+      - name: Install dependencies
+        run: npm install
+      - name: Install gulp cli
+        run: sudo npm install -g gulp-cli
+  unit-test:
+    name: Run unit tests
+    runs-on: ubuntu-22.04
+    needs: setup
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Run unit tests
+        run: gulp test --browserstack --nolintfix
+  e2e-test:
+    name: Run e2e tests
+    runs-on: ubuntu-22.04
+    needs: setup
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Run e2e tests
+        run: gulp e2e-test

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://circleci.com/gh/prebid/Prebid.js.svg?style=svg)](https://circleci.com/gh/prebid/Prebid.js)
+[![Prebid CI](https://github.com/prebid/Prebid.js/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/prebid/Prebid.js/actions/workflows/test.yml)
 [![Percentage of issues still open](http://isitmaintained.com/badge/open/prebid/Prebid.js.svg)](https://isitmaintained.com/project/prebid/Prebid.js "Percentage of issues still open")
 [![Coverage Status](https://coveralls.io/repos/github/prebid/Prebid.js/badge.svg)](https://coveralls.io/github/prebid/Prebid.js)
 

RELEASE_SCHEDULE.md

@@ -26,7 +26,7 @@ Announcements regarding releases will be made to the #prebid-js channel in prebi
 
 ### 2. Make sure all browserstack tests are passing
 
-   On PR merge to master, CircleCI will run unit tests on browserstack. Checking the last CircleCI build [here](https://circleci.com/gh/prebid/Prebid.js) for master branch will show you detailed results.**
+   On PR merge to master, Github Actions will run unit tests on browserstack. Checking the last GitHub Actions build [here](https://github.com/prebid/Prebid.js/actions/workflows/test.yml) for master branch will show you detailed results.**
 
    In case of failure do following,
      - Try to fix the failing tests.