Migrate to Github Actions

.github/workflows/main.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on: [push]
+
+env:
+  CI: true
+
+jobs:
+  Test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        channel: [stable, beta]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v1
+    - uses: UziTech/action-setup-atom@v2
+      with:
+        version: ${{ matrix.channel }}
+    - name: Install windows-build-tools
+      if: ${{ matrix.os == 'windows-latest' }}
+      run: |
+        npm config set msvs_version 2019
+    - name: Install dependencies
+      run: apm install
+    - name: Run tests
+      run: npm run test

README.md

@@ -1,4 +1,5 @@
 # Teletype for Atom
+![CI Status](https://github.com/atom/teletype/actions/workflows/main.yml/badge.svg)
 
 An Atom package that lets developers share their workspace with team members and collaborate on code in real time.