Automate publishing releases on GitHub (airsidemobile#249)

* Automatically create a release on GitHub

* Ignore vi swp files

* Add comment to fastfile

* Remove vim specifics from gitignore

Author: Daniel

.gitignore

@@ -86,3 +86,4 @@ fastlane/test_output
 
 # Sonarqube
 .scannerwork
+

fastlane/Fastfile

@@ -1,4 +1,5 @@
-require 'fileutils'
+require "fileutils"
+require "tempfile"
 
 fastlane_version "2.63.0"
 
@@ -162,9 +163,27 @@ lane :release do
   # Puplish pod
   pod_push(path: "JOSESwift.podspec")
 
+  # Publish release
+  publish_release
+
   ensure_git_status_clean
 end
 
+desc "Publishes the release on GitHub"
+lane :publish_release do
+  version = get_version_number(target: "JOSESwift")
+
+  changelog = File.read("../CHANGELOG.md")
+  changes = changelog[/(- .+\(#.+\)\n)+/] # Filter latest change set (e.g. "- Add some feature (#123)\n...").
+  tmp_changelog = Tempfile.new("jose-changelog")
+  tmp_changelog.write(changes)
+  tmp_changelog.close
+
+  system("gh release create #{version} --title v#{version} --notes-file #{tmp_changelog.path}")
+
+  tmp_changelog.unlink
+end
+
 desc "Run Sonarqube analysis after running the test lane"
 lane :sonarqube do |options|
   unless ENV['FL_SONAR_LOGIN']