[Elastic Agent] Starting docker container when enrollment

[simitt]

It seems #23973 introduced a regression for when starting the Elastic Agent docker container.
When starting the container by not providing an enrollment token, the script fails with /usr/local/bin/docker-entrypoint: line 43: ${$apikeyId}: bad substitution.

It seems the additional '$' in ${$apikeyId} is the root cause.

[elasticmachine]

Pinging @elastic/agent (Team:Agent)

[mtojek]

Fix in-progress: #24036

[simitt]

Thanks for the fix, I had it self-assigned and put up a PR already #24035 :)
Closing in favor of your fix then.

[ph]

closing #24036 is merged.