perf(build): use zstd instead of gzip for weblog image compression

[rochdev]

Summary

• Replaces gzip with zstd for saving and loading weblog image artifacts in build.sh
• Updates the artifact filename extension from .tar.gz to .tar.zst
• Fixes unquoted $BINARIES_FILENAME variable references

Dependencies

None — this PR is independent and can be merged in any order.

Test plan

• Run a weblog build with --save-to-binaries and verify the .tar.zst artifact is created
• Verify the artifact can be loaded back correctly in a subsequent run

🤖 Generated with Claude Code

[github-actions]

CODEOWNERS have been resolved as:

utils/_context/containers.py                                            @DataDog/system-tests-core
utils/build/build.sh                                                    @DataDog/system-tests-core

[datadog-datadog-prod-us1]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 2 Pipeline jobs failed

Testing the test | System Tests (golang, dev) / End-to-end #2 / net-http-orchestrion 2     

🛟 This job is unlikely to succeed on retry. Please review your pipeline configuration.

Failed to pull image 'mcr.microsoft.com/mssql/server'. Access denied or repository does not exist. Consider running 'docker login'.

Testing the test | all-jobs-are-green     

See error

Check Run failed: System Tests (golang, dev) / End-to-end #2 / net-http-orchestrion.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

Useful? React with 👍 / 👎

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 0dc377d | Docs | Datadog PR Page | Give us feedback!}

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 0dc377df6e

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".

[chatgpt-codex-connector]

Load zstd artifacts through Docker directly

In environments that have Docker but not the zstd CLI, the downloaded weblog artifact can no longer be loaded because this path now shells out to zstd before docker load; the run-end-to-end.yml/debug-harness.yml test jobs download binaries/ and call ./build.sh without installing that tool. Docker's own load command documents that it can read tar archives compressed with gzip, bzip2, xz, or zstd from --input/STDIN, so using docker load --input "$BINARIES_FILENAME" here would preserve the new artifact format without adding a new runtime dependency to every artifact consumer.

Useful? React with 👍 / 👎.