Concourse semver resourcetype

Hi,

I am trying to use the semver resource

- name: version
    type: semver
    source:
      driver: git
      initial_version: 0.0.0
      uri: git@github.url.com:xyz-abc/DemoProject.git
      branch: version
      file: version
      private_key:  ((github-enterprise.private-key)) 

and i get the following error

error bumping version: private keys with passphrases are not supported

get the same error when i use

private_key: |
        ((github-enterprise.private-key)) 
      or
private_key: ((github-enterprise.private-key))

Appreciate any suggestions in fixing the error.

It seems your SSH key is password-protected.

I am also looking for best solution for bumping version specially in maven case. is there any working reference for semver and how it will bump the version.