Move docker build to separate job

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[elrayle]

NOTE: test doesn't run because it is being replaced by Run Docker build and tests. The branch settings will need to be updated when this is merged to require that action instead. Test that the change works in the service repo before merging this PR.

Related Work:

• https://github.com/clearlydefined/service/pull/1126
• https://github.com/clearlydefined/crawler/pull/580