feat: show when new version is available

[craicoverflow]

Closes #178

Limitations: If you are currently using a pre-release version, this does not check for an update. We could improve this in the future.

Verification Steps

1. Build the CLI with a version which is below the current latest version:

RHOAS_VERSION=0.1.0 make binary

1. Run any command in debug mode OR login.

$ ./rhoas version -d
rhoas version 0.1.0

A new version of rhoas is available: 0.22.2
https://github.com/redhat-developer/app-services-cli/releases/tag/0.22.2

❯ ./rhoas login
Logging in...
Logged in successfully
Logging in to MAS-SSO...
Logged in successfully to MAS-SSO

You are now logged in as "craicoverflow"

A new version of rhoas is available: 0.22.2
https://github.com/redhat-developer/app-services-cli/releases/tag/0.22.2

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation change
• Other (please specify)

Checklist

• CI and all relevant tests are passing
• Code Review completed
• Verified independently by reviewer

[wtrocki]

👁️

[wtrocki]

Detection in debug mode is only temporary right?
How do you see this evolving

[craicoverflow]

Detection in debug mode is only temporary right?
How do you see this evolving

Two places currently:

• When you log in
• When you are in debug mode

But should extend it to the version command also. I don't want to display it in too many places like on every command - that would be quite annoying IMO.

[wtrocki]

Kudos for ignoring prereleases and dev versions :D

Tested it locally with dev, prerelease and proper version :)

[craicoverflow]

I've added it to the version command now too.