Multiple config profile

[gazarenkov]

Description

In order to be able to support different types of Backstage configuration (in contrary of having Operator to RHDH/Backstage Showcase only) Kustomize scripts (./config/*) and Makefile was reworked to support 2 types of configuration:

• RHDH - default, nothing changed if you run the commands as it used to be
• backstage.io - bare backstage, image on https://github.com/backstage/backstage/pkgs/container/backstage
• there is also third experimental profile called "external", suppose to be used by third-party configuration (TBD later, just to mention why: mostly as a placeholder for the time)

So, now, it is possible to put PROFILE variable to related Make commands and test/run/deploy related configuration, e.g:

• PROFILE=backstage.io make install run
• PROFILE=backstage.io make test
• PROFILE=backstage.io make deploy
• ...

Which issue(s) does this PR fix or relate to

#47 (JIRA: https://issues.redhat.com/browse/RHIDP-1338)

PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

Try to run commands with PROFILE=backstage.io and PROFILE=default (which is the same a no profile, i.e. RHDH).

NOTE: this PR is on a draft state, all the details are potential subject to change
NOTE2: Mind that in contrary to RHDH, deploying bare Backstage is faster than deploying PGSQL, so usually the container run with 3rd or so attempt (DB is not accessible).

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[sonarcloud]

Quality Gate failed

Failed conditions
C Security Rating on New Code (required ≥ A)

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[openshift-merge-robot]

PR needs rebase.

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