Migrate to GitHub actions

Author: jasonbosco

.github/workflows/tests.yml

@@ -0,0 +1,27 @@
+name: tests
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['2.6', '2.7', '3.0']
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - run: bundle exec rubocop
+      - run: bundle exec rspec --format documentation
+      - uses: actions/upload-artifact@v3
+        with:
+          name: coverage
+          path: coverage/
+          retention-days: 1

README.md

@@ -1,4 +1,4 @@
-# Typesense Ruby Library [![Gem Version](https://badge.fury.io/rb/typesense.svg)](https://badge.fury.io/rb/typesense) [![CircleCI](https://circleci.com/gh/typesense/typesense-ruby.svg?style=shield&circle-token=063f2179925b0b37d540126f6c96f6e1fe23f1b9)](https://circleci.com/gh/typesense/typesense-ruby) [![codecov](https://codecov.io/gh/typesense/typesense-ruby/branch/master/graph/badge.svg)](https://codecov.io/gh/typesense/typesense-ruby)
+# Typesense Ruby Library [![Gem Version](https://badge.fury.io/rb/typesense.svg)](https://badge.fury.io/rb/typesense) 
 
 
 Ruby client library for accessing the [Typesense HTTP API](https://github.com/typesense/typesense).