[build system] automatically keep rd-cli version up to date

[gschueler]

Currently done manually

we should do this automatically.

suggest we ping the github API for packages from https://github.com/rundeck/rundeck-cli to find the latest release number

something like:

curl -H "Accept: application/vnd.github+json" \
   https://api.github.com/repos/rundeck/rundeck-cli/releases  \
   |  jq -r '.[0].tag_name' \ 
   |  sed 's/v//'

[fdevans]

I know we dynamically pull in the version number for the Rundeck parts. I can try to find that code and see if this can get incoroprated. I believe it's in the CircleCI process.

[fdevans]

will be fixed with 4.6.0 release PR