Re-organize Makefile into smaller managable pieces

[pmacik]

Signed-off-by: Pavel Macík pavel.macik@gmail.com

Changes

Currently, there is only one big Makefile with everyghing in which makes it difficult to read, navigate and manage.

Splitting it into smaller managable pieces remove those pitfalls.

Additionally, having parts of Makefile organized in smaller pieces by a topic such as build or docs makes it possible to skip acceptance testing PR checks in cases of PRs that do not affect images that are build from sources and tested by the acceptance tests (for example PRs that only touches documentation).

In such cases there is not much value running the full acceptance testing arsenal that takes hours to complete and tests something that is already tested. Not running acceptance tests for PR such as documentation related ones significantly reduces time for those PRs to get merged as well as the cost spent for OpenShift CI jobs that provisions (currently 4) OCP clusters on AWS for each PR check run.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• All acceptance test scenarios included in the PR which verifies a bugfix or a requested feature reported by a non-member are tagged with @external-feedback tag.
• Follows the commit message standard

[pmacik]

/test performance

[codecov]

Codecov Report

Merging #1148 (c796147) into master (c796147) will not change coverage.
The diff coverage is n/a.

❗ Current head c796147 differs from pull request most recent head c77b88d. Consider uploading reports for the commit c77b88d to get more accurate results

@@           Coverage Diff           @@
##           master    #1148   +/-   ##
=======================================
  Coverage   57.84%   57.84%           
=======================================
  Files          31       31           
  Lines        2697     2697           
=======================================
  Hits         1560     1560           
  Misses        976      976           
  Partials      161      161           

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[pmacik]

/test performance

[pmacik]

/retest

[dperaza4dustbit]

/lgtm

[sadlerap]

/lgtm

[sadlerap]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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