AGENT-508: add dockerfile for generating release image

[andfasano]

This is a preliminary step to start moving the dockerfile within the repo (currently defined in the CI config)

[openshift-ci-robot]

@andfasano: This pull request references AGENT-508 which is a valid jira issue.

In response to this:

This is a preliminary step to start moving the dockerfile within the repo (currently defined in the CI config)

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[openshift-ci]

@andfasano: all tests passed!

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[andfasano]

/assign @bfournie

[bfournie]

/lgtm

[bfournie]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andfasano, bfournie

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