Cherry-pick #24220 to 7.x: [Elastic Agent] Add support for Fleet Server inside Docker #24291
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Cherry-pick of PR #24220 to 7.x branch. Original message:
What does this PR do?
First it refactors the entrypoint for the Elastic Agent docker container to use a new subcommand
container. This subcommand is designed specifically to be executed by the container runtime. Based on the defined environment variables it prepares the Elastic Agent to run in that environment. Due to the large number of environment variables that Elastic Agent needed and the complexity of the order of operations based it was best to move this from a bash script to golang.With the refactor comes the ability to bootstrap the Elastic Agent inside of a docker container. Using the
FLEET_SERVER_ENABLEflag the docker container will bootstrap the Fleet Server and enroll the Elastic Agent all inside the container on startup.Why is it important?
To allow Fleet Server to be spawned under Elastic Agent while being executed under Docker.
Checklist
[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files[ ] I have added tests that prove my fix is effective or that my feature worksCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.