Force bundler update to specific version

Author: Jean85

Gemfile.lock

@@ -37,4 +37,4 @@ RUBY VERSION
    ruby 2.5.9p229
 
 BUNDLED WITH
-   2.2.16
+   2.3.26

bin/html-proofer.sh

@@ -2,7 +2,8 @@
 
 set -e
 
-gem install bundler
+gem install bundler:2.3.26
+bundle update --bundler
 bundle install --path .bundle
 
 bundle exec htmlproofer output_dev \

docker/ruby/Dockerfile

@@ -14,4 +14,4 @@ RUN addgroup -g $GID fig && adduser -D -G fig -u $UID fig
 USER fig
 
 # update to bundler 2.0
-RUN gem install bundler:2
+RUN gem install bundler:2.3.26