NO-ISSUE: Align build dockerfile to use go-toolset for go & centos9 for dep

[pastequo]

Second round of CI adjustment https://github.com/openshift/assisted-installer-agent/pull/735

This time, trying to align our build dockerfile on the same logic across our repo

/cc @danmanor

[openshift-ci-robot]

@pastequo: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift/assisted-installer-agent/pull/745): >Second round of CI adjustment https://github.com/openshift/assisted-installer-agent/pull/735 > >This time, trying to align our build dockerfile on the same logic across our repo > >/cc @danmanor Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fassisted-installer-agent). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pastequo Once this PR has been reviewed and has the lgtm label, please assign eliorerz for approval. For more information see the Kubernetes Code Review Process.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.97%. Comparing base (3963f20) to head (143b49a). Report is 2 commits behind head on master.

Additional details and impacted files

[](https://app.codecov.io/gh/openshift/assisted-installer-agent/pull/745?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openshift) ```diff @@ Coverage Diff @@ ## master #745 +/- ## ========================================== + Coverage 59.91% 59.97% +0.05% ========================================== Files 74 74 Lines 3710 3710 ========================================== + Hits 2223 2225 +2 + Misses 1329 1328 -1 + Partials 158 157 -1 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/openshift/assisted-installer-agent/pull/745/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openshift)

[openshift-ci[bot]]

@pastequo: all tests passed!

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[pastequo]

/hold

[pastequo]

/unhold

[openshift-merge-robot]

PR needs rebase.

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