fix(build): bake devcontainer.metadata LABEL into built images

[skevetter]

Summary

• BuildOptions.Labels was correctly populated with the devcontainer.metadata label but never passed as --label flags to the docker buildx build command
• Added appendLabels helper (with sorted keys for deterministic output) and wired it into buildDockerBuildxArgs, matching the existing pattern used by appendBuildArgsAndContexts
• The buildkit code paths already handled labels correctly; this fix closes the gap for the docker buildx path

[netlify]

✅ Deploy Preview for devsydev canceled.

Name	Link
🔨 Latest commit	61d5465
🔍 Latest deploy log	https://app.netlify.com/projects/devsydev/deploys/69ea4363448e15000832d0a3

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Configuration used: Organization UI

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Run ID: 7da88183-bf63-4108-8ea2-2914dd491623

📥 Commits

Reviewing files that changed from the base of the PR and between 93e0da3 and 61d5465.

📒 Files selected for processing (1)

• pkg/driver/docker/build.go

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