Add GitHub workflows for test and release

Also:
 - Fix test scenario that failed due
   to fuzzy completions
 - Bump Cucumber

Fixes #36

test/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.5.8-slim-buster
+FROM ruby:2.7-slim-buster
 
 # Install dependencies
 RUN apt-get update \
@@ -7,6 +7,8 @@ RUN apt-get update \
         curl \
         unzip \
         zip \
+        ruby-dev \
+        build-essential \
  && apt-get clean
 
 WORKDIR app
@@ -38,4 +40,4 @@ RUN ls -R $TEST_HOME/.config/fish/
 # Run tests
 COPY test ./
 ENTRYPOINT ["cucumber"]
-CMD []
+CMD ["--publish-quiet"]

test/Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
 group :test do
-  gem 'cucumber', '~> 3.1.0'
-  gem 'rspec', '~> 3.7.0'
+  gem 'cucumber', '~> 5'
+  gem 'rspec', '~> 3'
 end

test/features/completions.feature

@@ -149,7 +149,7 @@ Feature: Shell Completion
             | ini           | init                    | /^(?!init).*$/                  |
             | ins           | install                 | /^(?!install).*$/               |
             | c             | clear                   | /^(?!clear).*$/                 |
-            | a             |                         | /.*/                            |
+            | b             |                         | /.*/                            |
             | 'init '       |                         | /.*/                            |
             | 'clear '      |                         | /.*/                            |
             | 'install '    |                         | /.*/                            |

test/features/step_definitions/setup.rb

@@ -34,14 +34,14 @@ def _uninstall_candidate_version(candidate_dir)
 end
 
 When(/^candidate (\w+) is uninstalled$/) do |candidate|
-  puts `ls ~/.sdkman/candidates/#{candidate}`
+  log `ls ~/.sdkman/candidates/#{candidate}`
   Dir["#{ENV['HOME']}/.sdkman/candidates/#{candidate}/*"].each do |candidate_dir|
     _uninstall_candidate_version(candidate_dir)
   end
-  puts `ls ~/.sdkman/candidates/#{candidate}`
+  log `ls ~/.sdkman/candidates/#{candidate}`
 end
 
-Given(/^file ([a-zA-Z0-9-_.\/]+) exists with content/) do |filename,content|
+Given(/^file ([a-zA-Z0-9\-_.\/]+) exists with content/) do |filename,content|
   FileUtils.mkdir_p(File.dirname(filename))
   File.write(filename, content)
 end

test/features/support/parameter_types.rb

@@ -6,6 +6,7 @@ ParameterType(
   type: Array,
   transformer: lambda do |*patterns|
                  patterns \
+                   .select { |s| !s.nil? } # Huh? Well, if it helps...
                    .map(&:strip) \
                    .map do |s|
                      s = if %r{^/(.*)/$} =~ s