fix nginx compilation flags

[dmitry-j-mikhin]

• use '-O2' instead of '-Og'
  '-O2' produce production optimized binary while '-Og' is used mostly
  for debugging
• use '-mtune=generic' instead of '-mtune=native'
  '-mtune=native' produce optimal code for builder host system, but it
  can be sub-optimal for execution host system

What this PR does / why we need it:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

fixes #8022

How Has This Been Tested?

All existing tests has passed

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ dmitry-j-mikhin (142f17dd2a8a6e95f2b90bfb45815f4530d392dd)

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[k8s-ci-robot]

Hi @dmitry-j-mikhin. Thanks for your PR.

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[strongjz]

/ok-to-test
/triage accepted
/priority long-term-important

[k8s-ci-robot]

@strongjz: The label(s) priority/long-term-important cannot be applied, because the repository doesn't have them.

In response to this:

/ok-to-test
/triage accepted
/priority long-term-important

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[iamNoah1]

/priority important-longterm

[iamNoah1]

/kind bug

[rikatz]

/lgtm
/approve

This will tho be used only when we do a new nginx container release (not container), so we will need to wait a bit until this happens :)

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dmitry-j-mikhin, rikatz

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