feat(startup): log git commit SHA at startup: v0.54.0

[vparfonov]

Summary

Add Git commit SHA to Vector startup log for build traceability. When Vector starts, it now logs the commit SHA it was built from, making it easy to identify which code version is running in dev, test, and production environments.

Example output:
Vector has started. debug="false" version="0.47.0" arch="x86_64" revision="" git_commit="8f50ca91d5"

Implementation

Uses a three-tier fallback approach to detect the commit in all build scenarios:

1. Git command (git rev-parse --short HEAD) — works for local dev builds with full .git
2. GIT_COMMIT environment variable — set by Makefile's build target
3. Direct .git file reading — reads .git/HEAD and ref files for Docker/CI builds

Includes minimal .git metadata (~208KB) in Docker build context:

• .git/HEAD — pointer to current branch
• .git/refs/heads/ — branch commit references
• .git/packed-refs — packed ref fallback

Changes

• build.rs: git_short_hash() with three fallbacks, optional constant
• src/internal_events/process.rs: git_commit field in startup log
• src/lib.rs: handle Option<&str> in version string with .unwrap_or("unknown")
• Makefile: export GIT_COMMIT in build/build-offline, add make image target with macOS platform detection
• .dockerignore: allow minimal .git metadata with explanatory comment

/assign @jcantrill

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[vparfonov]

/hold

[jcantrill]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jcantrill, vparfonov

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[jcantrill]

blocked by openshift/cluster-logging-operator#3482 where minio is missing

[jcantrill]

/override ci/prow/clo-functional
/override ci/prow/cluster-logging-operator-e2e

[openshift-ci]

@jcantrill: Overrode contexts on behalf of jcantrill: ci/prow/clo-functional, ci/prow/cluster-logging-operator-e2e

Details

In response to this:

/override ci/prow/clo-functional
/override ci/prow/cluster-logging-operator-e2e

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[vparfonov]

/retest

[openshift-ci]

@vparfonov: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/clo-functional	2567d92	link	true	/test clo-functional
ci/prow/cargo-fmt-check	92a262c	link	false	/test cargo-fmt-check
ci/prow/cargo-clippy-check	92a262c	link	false	/test cargo-clippy-check

Full PR test history. Your PR dashboard.

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