Add support for on-premise enterprise github

[gislikonrad]

An option should be added to apigeecli apis create github to supply an alternative to https://www.github.com as the base url. This would help those of us who are running GitHub enterprise on-premise.

Example
apigeecli apis create github -n helloworld -u sandbox -r helloworld-proxy -p proxies/helloworld/apiproxy -b https://my.github.local

[ssvaidyanathan]

@gislikonrad - we just released a beta version
Can you try installing that and see if the support for on-prem GitHub works?

export APIGEECLI_VERSION=v1.124.0-beta
curl -L https://raw.githubusercontent.com/apigee/apigeecli/main/downloadLatest.sh | sh -

[gislikonrad]

apigeecli -v
apigeecli version 1.124.0-beta date: 2023-09-20T19:06:10Z [commit: 0ef1ca9]

apigeecli apis create github -g https://git.internal -u infrastructure -r apigee-cloud -p proxies/coffee/apiproxy -n coffee -o sandbox
Error: unknown shorthand flag: 'g' in -g
Usage:
apigeecli apis create github [flags]

Aliases:
github, gh

Flags:
-h, --help help for github
-n, --name string API Proxy name
-u, --owner string The github organization or username. ex: In https://github.com/apigee, apigee is the owner name
-p, --proxy-path string The path in the repo to the apiproxy folder. ex: sample-proxies/apikey/apiproxy
-r, --repo string The github repo name. ex: https://github.com/apigee/api-platform-samples, api-platform-samples is the repo

Global Flags:
-a, --account string Path Service Account private key in JSON
--disable-check Disable check for newer versions
--metadata-token Metadata OAuth2 access token
--no-output Disable printing all statements to stdout
-o, --org string Apigee organization name
--print-output Control printing of info log statements (default true)
-t, --token string Google OAuth Token

[ssvaidyanathan]

@gislikonrad - you need to set that as preference
Please check this

[gislikonrad]

So, I didn't realize that the apigeecli just used http to get the repo. I assumed that it used a preinstalled git client and the associated configuration. GitHub enterprise on-premise requires authentication, even for public repositories. So attempting to use the github feature with on-premise github fails with a 406 status code that attempts to redirect you to a login page.

Also, when performing apigeecli prefs set -g <url>, it overwrites clears the organization preference.