feat: use build tool to generate ingress templates

[shreddedbacon]

Checklist

• Affected Issues have been mentioned in the Closing issues section
• Documentation has been written/updated
• PR title is ready for changelog and subsystem label(s) applied

The way ingress templates are created using bash can be slow, using this new tool to handle the templating is significantly faster for environments that have a lot of ingress objects. It doesn't use helm to generate the templates.

Example, a project with 1500 ingress(!!) can take hours with the previous bash because of all the underlying calls to shyaml. With this tool it can do the templating for the same ingress objects in under 10s (applying them is another story)

This only handle custom-ingress for the time being, autogenerated routes are still handled with bash and helm templates.

Tool code lives here for the time being: https://github.com/uselagoon/build-deploy-tool