Build manager binary in a modular way

[razo7]

Why we need this PR

Allow default values for building Golang manager binary using build.sh, and support for other flags.

Changes made

• Build manager binary in a modular way

Relates to ECOPROJECT-1972

Test plan

Similar to medik8s/node-maintenance-operator#135

[openshift-ci]

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[razo7]

Not sure why it is used here. Other operators create in bin directory (we already create it in https://github.com/medik8s/machine-deletion-remediation/pull/145/files#diff-3d78da75ea6dd0aa86fac99d385c70af27002c3d2cc205934432150e2f2ccf9cR10),
Any thoughts? @clobrano

[clobrano]

The makefile builds the binary under bin/ directory, but the Dockerfiles have the binary built directly in the root

https://github.com/clobrano/machine-deletion-remediation/blob/2632f1609758846a91614ebe88fe3696ae64fa2d/Makefile#L189-L190

https://github.com/clobrano/machine-deletion-remediation/blob/2632f1609758846a91614ebe88fe3696ae64fa2d/Dockerfile#L36-L37

I don't really remember why, but it is on purpose

[mshitrit]

/test ?

[openshift-ci]

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• /test 4.16-ci-bundle-machine-deletion-remediation-bundle
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[mshitrit]

/test 4.16-openshift-e2e

[mshitrit]

/lgtm

[razo7]

/retest

[razo7]

/retest

[razo7]

/cherry-pick release-0.3

[openshift-cherrypick-robot]

@razo7: new pull request created: #146

In response to this:

/cherry-pick release-0.3

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