Fix required bundler version for ruby app

lxc-apps/crisiscleanup/lxcfile

@@ -14,7 +14,8 @@ RUN EOF
     git clone --depth 1 https://github.com/CrisisCleanup/crisiscleanup /srv/crisiscleanup
 
     # Hackfix ruby dependency versions
-    sed -i 's/2\.4\.4/2.4.5/' /srv/crisiscleanup/Gemfile
+    sed -i 's/ruby "2\.4\.4"/ruby "2.4.5"/' /srv/crisiscleanup/Gemfile
+    gem install bundler:1.16.6
 
     # Install Ruby and NodeJS dependencies
     cd /srv/crisiscleanup

lxc-apps/decidim/lxcfile

@@ -49,6 +49,7 @@ RUN EOF
     rm -f /etc/nginx/*.default
 
     # Install Decidim
+    gem install bundler:1.17.3
     bundle config build.nokogiri --use-system-libraries
     gem install decidim
     cd /srv

lxc-apps/opendatakit/opendatakit-build.lxcfile

@@ -13,6 +13,7 @@ RUN EOF
 
     # Install Ruby dependencies
     cd /srv/opendatakit-build
+    gem install bundler:1.13.6
     bundle install --without test
     rake deploy:build