ci: switch to GitHub Actions

Author: grzuy

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: build
+
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - '3.0'
+          - '2.7'
+          - '2.6'
+          - '2.5'
+          - '2.4'
+          - truffleruby
+        gemfile:
+          - openssl_2_2
+          - openssl_2_1
+    env:
+      BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - run: bundle exec rake

.travis.yml

@@ -1,13 +1,5 @@
 # frozen_string_literal: true
 
-appraise "cose_head" do
-  gem "cose", git: "https://github.com/cedarcode/cose-ruby"
-end
-
-appraise "openssl_head" do
-  gem "openssl", git: "https://github.com/ruby/openssl"
-end
-
 appraise "openssl_2_2" do
   gem "openssl", "~> 2.2.0"
 end