[TBT-76] replace licensing links update dockerfile and gemfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.6.3-slim
+FROM ruby:2.6.10-bullseye
 LABEL maintainer Travis CI GmbH <[email protected]>
 
 # packages required for bundle install
@@ -25,7 +25,7 @@ COPY Gemfile      /app
 COPY Gemfile.lock /app
 
 RUN gem install bundler:2.4.22
-RUN bundler install --verbose --retry=3
+RUN bundle install --verbose --retry=3
 RUN gem install --user-install executable-hooks
 
 COPY . /app

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.6.3'
+ruby '>= 2.6.3', '< 2.7'
 
 gem 'faraday'
 gem 'html-proofer', '~> 3.0'

_includes/enterprise_sidebar.html

@@ -51,7 +51,7 @@ <h3>Enterprise 2.x Archive</h3>
         <li><a href="/user/enterprise/high-availability-tcie-2.x/">High Availability for 2.x</a></li>
         <li><a href="/user/enterprise/platform-tips-tcie-2.x/">Platform Administration Tips for 2.x</a></li>
       </ul>
-      
+
       <h3>Travis CI Docs</h3>
       <ul>
         <li><a href="/">Travis CI Docs</a></li>
@@ -62,7 +62,7 @@ <h3>Travis CI Docs</h3>
   <section class="sidebar-notice">
     <p>This documentation site is open source.
       The <a href="https://github.com/travis-ci/docs-travis-ci-com">README in our Git repository</a> explains how to contribute.</p>
-    <p>Travis CI relies on Open Source <a href="/user/open_source_license/">licensing information</a>.</p>
+    <p>Travis CI relies on Open Source <a href="https://app.travis-ci.com/licensing">licensing information</a>.</p>
   </section>
 
 </div><!-- /#sidebar -->

_includes/sidebar.html

@@ -146,7 +146,6 @@ <h3>Travis CI Enterprise</h3>
   <section class="sidebar-notice">
     <p>This documentation site is Open Source.
       The <a href="https://github.com/travis-ci/docs-travis-ci-com">README in our Git repository</a> explains how to contribute.</p>
-    <p>Travis CI relies on Open Source <a href="/user/open_source_license/">licensing information</a>.</p>
+    <p>Travis CI relies on Open Source <a href="https://app.travis-ci.com/licensing">licensing information</a>.</p>
   </section>
-
 </div><!-- /#sidebar -->