Set geonode lb host port based on external scheme

[AlexGacon]

Description

Set geonode lb host port based on external scheme

Type of Change

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• Bug fix
• New feature
• Documentation update
• Refactoring
• Other (please describe)

Related Issue

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closes #121

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[ridoo]

@AlexGacon See my comments here: #121 (comment)

[AlexGacon]

@ridoo I took your remark into account.

[AlexGacon]

@mwallschlaeger without this one, I have to manually change the env variable on the geoserver Statefulset to have oauth2 working

[AlexGacon]

After some additional tests, the only way for me to have oauth working correctly is to set the SUBSTITUTION_URL env variable for GS to the public URL of the stack.

[mwallschlaeger]

I tested this change and the oauth variables in geoserver and geonode are properly set.