Session manager plugin

[nitrocode]

Closes #817

Not sure how to install the executable silently on Windows.

[yob]

I've run a build and confirmed this works as expected.

is it possible to rebase onto master (to get #819) and remove the merge commits?

[yob]

One thing I haven't done is actually test the plugin works. We don't really use SSM yet though, so that test wouldn't be straight forward. Have you been able to run a build with one of these AMIs and confirm the plugin works as intended?

[nitrocode]

I've run a build and confirmed this works as expected.

Perfect.

is it possible to rebase onto master (to get #819) and remove the merge commits?

Done.

One thing I haven't done is actually test the plugin works. We don't really use SSM yet though, so that test wouldn't be straight forward. Have you been able to run a build with one of these AMIs and confirm the plugin works as intended?

I did not build an AMI but I did run the script on an x86 and an arm machine to make sure it installs correctly. Then I gave the iam role of my instance access to ssm:StartSession across * resources. Finally, I ran this command from the buildkite ec2 instance where I installed the session-manager-plugin and it worked as expected.

$ aws --region us-west-2 ssm start-session --target i-snip

Starting session with SessionId:

[yob]

Lovely, thanks!