Do not check for valid url for .gitlab-ci.yml

Until this commit, GitLab would check if the URL in your .gitlab-ci.yml
would be valid and adressable. However, this approach is rather limited.

To begin, the URL couldn't be http://example:$PORT/my-project, as the
PORT value would be interpolated after checking if the URL was valid,
which its not. Also this gem will limit the amount of protocols allowed.

This commit doesn't check, at all, if the URL is valid. This is now the
responsablilty of the user. In my opion this is right, as the user
ultimately benefits from a correct URL, but also, its impossible to
cover all cases.

lib/gitlab/ci/config/entry/environment.rb

@@ -33,7 +33,6 @@ module Gitlab
 
               validates :url,
                         length: { maximum: 255 },
-                        addressable_url: true,
                         allow_nil: true
 
               validates :action,

spec/lib/ci/gitlab_ci_yaml_processor_spec.rb

@@ -769,6 +769,19 @@ module Ci
           expect(builds.first[:environment]).to eq(environment[:name])
           expect(builds.first[:options]).to include(environment: environment)
         end
+
+        context 'the url has a port as variable' do
+          let(:environment) do
+            { name: 'production',
+              url: 'http://production.gitlab.com:$PORT' }
+          end
+
+          it 'allows a variable for the port' do
+            expect(builds.size).to eq(1)
+            expect(builds.first[:environment]).to eq(environment[:name])
+            expect(builds.first[:options]).to include(environment: environment)
+          end
+        end
       end
 
       context 'when no environment is specified' do

spec/lib/gitlab/ci/config/entry/environment_spec.rb

@@ -196,22 +196,5 @@ describe Gitlab::Ci::Config::Entry::Environment do
         end
       end
     end
-
-    context 'when invalid URL is used' do
-      let(:config) { { name: 'test', url: 'invalid-example.gitlab.com' } }
-
-      describe '#valid?' do
-        it 'is not valid' do
-          expect(entry).not_to be_valid
-        end
-      end
-
-      describe '#errors?' do
-        it 'contains error about invalid URL' do
-          expect(entry.errors)
-            .to include "environment url must be a valid url"
-        end
-      end
-    end
   end
 end