Adds browserless login

[iamkirkbater]

Adds browserless login and the ability to automatically log into a cluster on container launch.

[georgettica]

Got some one thing that may help us until srelogin is in a final form:
Can we pull it from the source? On my local setup I put it as a volume and kept pulling it, though for now taking the lastest should work aswell.

[georgettica]

I tried to "merge upstream" the srelogin, and found all we need to so is set one of 4 env vars to make it work without modifications

see closed PR mbarnes/work-environment#3 (comment)

[iamkirkbater]

Nice, thanks for the tip @georgettica. I've updated the cluster-login script to what's current as of 10 minutes ago and updated ocm-container.sh to reflect the USER env var (I still want to give flexibility for those who's OCM username might be different from their kerberos username.)

[georgettica]

which is mine aswell, you can always do

$ USER=aaa python3 -c 'import getpass; print(getpass.getuser())'
aaa

and call the srelogin with that argument

[iamkirkbater]

Right. If it changed a lot, or on a per-call basis you could do that. But setting it as a config var inside your env.source once is kind of a set-it-and-forget-it-until-you-have-to-set-this-up-again-and-then-you're-confused-because-nothing's-working-the-way-it-used-to approach.

[georgettica]

hahha, oki I am fine with that

[georgettica]

@drewandersonnz should we do something else before merging?

maybe a knowledge sharing on the internal setup of the configs?

[iamkirkbater]

These need to be set here so that this can become scriptable, as ~.bashrc is not run when the container inits without a TTY.

[georgettica]

/lgtm