Add a job to manually check/release the lock
Add a job to manually check/release the lock

If we need to retrigger the pipeline without finishing it we need
a job to release the lock.

Rename the job group "release" to "operator" as it contains several
jobs with generic operator actions.

alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf