[Snyk] Security upgrade alpine from 3.21.0 to 3.21.3

[khanhtc1202]

Snyk has created this PR to fix 3 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• cmd/pipecd/Dockerfile

We recommend upgrading to alpine:3.21.3, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	CVE-2025-26519 SNYK-ALPINE321-MUSL-8720634	436
	CVE-2025-26519 SNYK-ALPINE321-MUSL-8720634	436
	CVE-2024-13176 SNYK-ALPINE321-OPENSSL-8690014	436
	CVE-2024-13176 SNYK-ALPINE321-OPENSSL-8690014	436
	CVE-2024-12797 SNYK-ALPINE321-OPENSSL-8710358	436

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.32%. Comparing base (e3e4854) to head (49cff04).
Report is 267 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5566   +/-   ##
=======================================
  Coverage   26.32%   26.32%           
=======================================
  Files         467      467           
  Lines       50099    50099           
=======================================
  Hits        13189    13189           
  Misses      35855    35855           
  Partials     1055     1055           

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