Rename build-test to CI

Author: styd

.github/workflows/build-test.yml renamed to .github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: build-test
+name: CI
 env:
   CI: true
 

README.md

@@ -6,7 +6,7 @@
   <a href="https://rubygems.org/gems/apexcharts">
     <img src="https://img.shields.io/gem/v/apexcharts.svg?label=apexcharts" alt="Gem Version" /></a>
   <a href="https://github.com/styd/apexcharts.rb/actions">
-    <img src="https://github.com/styd/apexcharts.rb/workflows/build-test/badge.svg" alt="Build Test Status" /></a>
+    <img src="https://github.com/styd/apexcharts.rb/workflows/CI/badge.svg" alt="CI Status" /></a>
   <a href="https://rubygems.org/gems/apexcharts">
     <img alt="Downloads" src="https://img.shields.io/gem/dt/apexcharts"></a>
   <a href="https://github.com/styd/apexcharts.rb/blob/master/LICENSE">