Replaced `docker` with `image`

[ChaosInTheCRD]

the command on the makefile seems to have moved from docker to image, this cleans that up.

[jetstack-bot]

@ChaosInTheCRD: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[jetstack-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ChaosInTheCRD To complete the pull request process, please assign joshvanl You can assign the PR to them by writing /assign @joshvanl in a comment when ready.

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[jetstack-bot]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

:memo: Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• acf60d0 Replaced 'docker' with 'image'
• 6e03b36 Merge remote-tracking branch 'origin/fix-makefile' into fix-makefile

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[JoshVanL]

/lgtm

[davidcollom]

@ChaosInTheCRD Can you sign off your commits please.