feat(chart): allow using dex in development mode

[migmartri]

This PR apart of fixing the hardcoding DNS issue when the chart is deployed with another release name #1578, it allows using dex in a chart deployed in development mode #2107

It includes

• Ingress support in dex subchart
• Configuration update so it now takes into account that ingress and fixes the aforementioned issue.
• Dex upgrade
• Documentation in readme

To use it, just configure like this

dex:
  dex:
    # Point to the [controlplane http ingress]/auth/callback
    redirectURL: https://cp-miguel.k.chainloop.dev/auth/callback
    ingress:
      enabled: true
      tls: true
      hostname: dex-miguel.k.chainloop.dev

Fixes #1578 and #2107