migrate CI to GitHub Actions

Author: cfillion

.github/workflows/check.yml

@@ -0,0 +1,18 @@
+name: check
+on: [push, pull_request]
+jobs:
+  reapack-index:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Fetch repository
+      uses: actions/checkout@v2
+    - name: Install Pandoc
+      run:  sudo apt-get install -yy pandoc
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.7
+    - name: Install reapack-index
+      run:  gem install reapack-index --pre
+    - name: Validate packages
+      run:  reapack-index --check

.github/workflows/deploy.yml

@@ -0,0 +1,28 @@
+name: deploy
+on:
+  push:
+    branches: [master]
+jobs:
+  reapack-index:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Fetch repository
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Configure git
+      run: |-
+        git config user.name  'ReaTeam Bot'
+        git config user.email 'reateam-bot@cfillion.ca'
+    - name: Install Pandoc
+      run:  sudo apt-get install -yy pandoc
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.7
+    - name: Install reapack-index
+      run:  gem install reapack-index --pre
+    - name: Update index.xml
+      run:  reapack-index --commit
+    - name: Push changes
+      run:  git push

.travis.yml

@@ -1,6 +1,6 @@
 # ReaTeam JSFX Repository
 
-[![Build status](https://travis-ci.org/ReaTeam/JSFX.svg?branch=master)](https://travis-ci.org/ReaTeam/JSFX)
+![check](https://github.com/ReaTeam/JSFX/workflows/check/badge.svg)
 
 Community-maintained collection of JS effects for REAPER.