Use bundler version

Try specifying BUNDLER_VERSION

Sadly while the back-ticks installed the correct
bundler, the actual install used the wrong version.

Test backticks in Dockerfile run

Install bundler in Gemfile

Bundler is already installed, so install alone won't
install the correct version. Here we pull the version
last used to build the Gemfile.lock and install that.

Not 100% Dockerfiles support backticks, but will see.

UAT for GPL-515 - bug fix - edit step type

Merge pull request #112 from KatyTaylor/GPL-515-edit-step-type-bug

GPL-515 Edit Step Type page bug

GPL-515 - bug fix - edit step type

Merge pull request #112 from KatyTaylor/GPL-515-edit-step-type-bug

GPL-515 Edit Step Type page bug

UAT - GPL-476 - import tube racks

Merge pull request #108 from sanger/GPL-476-base

Gpl 476 import tube racks

uat-GPL-476-samples-extraction-tube-racks

Merge branch 'master' into develop

uat-2.0.14a02

Removes unneeded condition

dev-2.0.14a01

Added barcode generate for test

dev-2.0.14: Before printing barcodes, convert to the right format depending on how

it was originally stored.

release-2.0.13: Merge pull request #99 from sanger/develop

On preparing release