Add zizmor security scanner

[stephenfin]

What this PR does / why we need it:

Run zizmor on pushes to master and pull requests that modify workflow files. Results are uploaded as SARIF to GitHub's security-events API for code scanning integration.

Which issue this PR fixes(if applicable):

(none)

Special notes for reviewers:

This was previously done for Gophercloud in gophercloud/gophercloud#3659

Release note:

NONE

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[github-advanced-security]

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