Hi all,

I'm testing out a pipeline build in Jenkins using the AWS EC2 plugin.  Via 
the plugin, a build will spin up an EC2 instance and run my init script, 
which you will find detailed in the Gist below:

https://gist.github.com/bsodmike/7033ffeab2383599bb38a2bcf263aba4

The init script adds the `ubuntu` user to the docker group, however, at the 
very end of the slave spool-up, you'll notice that it only lists the 
'current groups' as root.

Once the Jenkins slave-agent is installed and the Jenkinsfile of the repo 
being run (as part of the pipeline job), in this context I've added several 
sets of debugging info, which I'll summarise below, yet detailed in full in 
the Gist linked above:

   - Within the context of the build steps a la the Jenkinsfile, the 
   current user is `ubuntu` with a UID of 1000
   - the `docker` group has a GID of 999 and `ubuntu` user has been added.
   - However, running `groups` shows that the current user's groups have 
   not been assigned.

At the moment, I can only get the docker run to work from within the slave 
agent (whilst parsing the Jenkinsfile that is) if I disconnect and 
re-connect to the slave EC2 agent, simply because Jenkins does this as a 
new SSH connection, and logs into a new session.

I've provided further comments at the bottom of the Gist as well - 
https://gist.github.com/bsodmike/7033ffeab2383599bb38a2bcf263aba4#gistcomment-2030828

Appreciate any advice on how to get around this - thanks!

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