Non blocking manual jobs

Manual jobs block the pipelines .i.e Pipelines won't have a success status until the manual jobs are run.

To allow pipelines to succeed even if the manual jobs are not run, we should specify allow_failure on them.

- if: '$CI_MERGE_REQUEST_IID'
  when: manual
  # If this is not specified the pipline will be blocked until
  # the job is run manually
  allow_failure: true 

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