First shot at github actions (#7)

* First shot at github actions

* Homegrown file_list to replace rake function

* This is embarassing...

.github/workflows/run_tests.yml

@@ -0,0 +1,39 @@
+# 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: Ruby
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.1', '3.2', '3.3', 'head']
+
+    steps:
+    - uses: ConorMacBride/install-package@v1
+      with:
+        apt: default-jdk
+    - uses: actions/checkout@v4
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      run: bundle exec rake

secretariat.gemspec

@@ -1,5 +1,17 @@
 require_relative 'lib/secretariat/version'
-require 'rake'
+
+# Rolling my own file_list to not have to rely on rake
+# as this breaks ruby-setup on GitHub actions
+# This should be good enough for now, even though
+# FileList does a lot more.
+def file_list(*patterns)
+  patterns.map do |pattern|
+    Dir.glob(pattern)
+  end.flatten.reject do |file|
+    File.basename(file).start_with?(".")
+  end
+end
+
 Gem::Specification.new do |s|
   s.name        = 'secretariat'
   s.version     = Secretariat::VERSION
@@ -8,7 +20,7 @@ Gem::Specification.new do |s|
   s.description = "a tool to help generate and validate ZUGFeRD invoice xml files"
   s.authors     = ["Jan Krutisch"]
   s.email       = '[email protected]'
-  s.files       = FileList['lib/**/*.rb', 'bin/*.jar', 'schemas/**/*', 'README.md']
+  s.files       = file_list('lib/**/*.rb', 'bin/*.jar', 'schemas/**/*', 'README.md')
   s.homepage    = 'https://github.com/halfbyte/ruby-secretariat'
   s.license       = 'Apache-2.0'