Fix RHEL 7 & 8 based distros to work around /tmp execution issues

[stevenhaddox]

Implements the suggested fix from #155 in order to enable rvm to install properly on CentOS 8 (and hopefully 7 and a few other distro variations as well).

Fixes #155

[stevenhaddox]

Shout out to @coofercat for the suggested fix.

[danochoa]

lgtm

[nartz]

I could use this as well - thanks!

[stevenhaddox]

Thought I'd follow-up on this to see if it might be able to be merged (I came across my #TODO in my galaxy file preventing me from being able to enable the galaxy collection for rvm until this is merged in).
cc @danochoa, maybe?

[stevenhaddox]

@sfgeorge @danochoa - pushed up the requested change. Let me know if you need anything else and thanks for your time.

[sfgeorge]

@stevenhaddox Fantastic, thank you for the quick change. I'm terribly sorry to ping-pong with another request, but could you add a brief entry in CHANGELOG.md? Just a bullet would about fixing installation error in CentOS 7&8 would do.

[stevenhaddox]

@sfgeorge no need to apologize. Thanks for your patience. Hopefully that last push is what you're looking for 🤞🏻

[sfgeorge]

I shall bother you no more, this hungry commit-monster is finally satiated!

Thank you for the great fix, @stevenhaddox !

[sfgeorge]

Oops, I don't have ability to move this forward. @danochoa Can you merge if you deem it ready?

[danochoa]

It looks like the old CI server is no longer working. Maybe @pkuczynski can help? I think I don't have access to fix this but I can poke around a bit later. https://travis-ci.org/github/rvm/rvm1-ansible/requests

[sfgeorge]

@danochoa I noticed the same and tracking as #233.

tl;dr With new pricing changes, it's possible but semi-painful to get a renewal of some Travis-CI build hours going. Alternatively, we can move to GitHub Actions.

[pkuczynski]

Thanks!