Pin actions and docker images to SHAs

[mhamza15]

Description

Pins actions and docker images to specific SHAs to help prevent supply chain attacks.

Related Issue(s)

Should automatically close many of the "Pinned-Dependencies" alerts: https://github.com/vitessio/vitess/security/code-scanning?query=is:open+branch:main+rule:PinnedDependenciesID+

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

AI Disclosure

Help from Claude

[vitess-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.89%. Comparing base (d38ee62) to head (519ccc6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19143      +/-   ##
==========================================
- Coverage   69.90%   69.89%   -0.01%     
==========================================
  Files        1613     1613              
  Lines      216076   216076              
==========================================
- Hits       151055   151034      -21     
- Misses      65021    65042      +21     

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[mattlord]

Thanks, @mhamza15 ! ❤️

[arthurschreiber]

Do we need a plan for how to keep the Dockerfile base image versions up to date without causing a lot of churn?

[arthurschreiber]

We probably should also do something like this on the v22 and v23 branches.

[mhamza15]

Do we need a plan for how to keep the Dockerfile base image versions up to date without causing a lot of churn?

We should be able to use Dependabot! I'll take a look at configuring it if it isn't already