[Snyk] Security upgrade alpine from 3.18.3 to 3.21.3

[cruizen]

Snyk has created this PR to fix 4 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):

• 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-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	614
	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	614
	Use After Free SNYK-ALPINE318-BUSYBOX-7249236	514
	Use After Free SNYK-ALPINE318-BUSYBOX-7249265	514
	Use After Free SNYK-ALPINE318-BUSYBOX-7249419	514

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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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Summary by Bito

Security update to Alpine base image from 3.18.3 to 3.21.3 across multiple Dockerfile stages (stager, gomplate, alpine). The upgrade addresses 4 vulnerabilities: 2 high-severity OpenSSL issues (CVE-2023-5363) and 3 medium-severity BusyBox UAF vulnerabilities.

Unit tests added: False

Estimated effort to review (1-5, lower is better): 1

[bito-code-review]

Code Review Agent Run #9bd795

Actionable Suggestions - 0

Review Details

• Files reviewed - 1 · Commit Range: d512aa7..d512aa7

  • Dockerfile
• Files skipped - 0
• Tools

  • Golangci-lint (Linter) - ✔︎ Successful
  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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Changelist by Bito

This pull request implements the following key changes.

Key Change	Files Impacted
Bug Fix - Security Vulnerability Fixes in Docker Base Image	- Dockerfile - Upgraded Alpine base image from 3.18.3 to 3.21.3 to fix multiple security vulnerabilities

[indradhanush]

Outdated by #43.