Set rbenv version in Jenkinsfile itself
Set rbenv version in Jenkinsfile itself

Fails on `source: not found`, so rather than try to source the file, move the logic into the Jenkinsfile itself.

Use the `bundleGem` method rather than `bundleApp` as we do not have a
Gemfile.lock present.

gds-operations/vcloud-edge_gateway,gds-operations/vcloud-edge_gateway,gds-operations/vcloud-edge_gateway