Episode 6 - Update API version for ingress

[porkbrain]

Updating apiVersion for networking in episode-06 in drupal-ingress resource to v1 from v1beta1.

Followed answers in these resources to achieve equivalent behaviour:

• https://stackoverflow.com/a/64126069/5093093
• https://forum.linuxfoundation.org/discussion/858146/lab10-1-error-creating-ingress-rule-pathtype-must-be-specified
• https://docs.openshift.com/container-platform/4.6/rest_api/network_apis/ingress-networking-k8s-io-v1.html

I tested this change with my local cluster (albeit not running drupal). I selected pathType: ImplementationSpecific because that seems to forward the URI to the app where router can decide what to do.

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Closes https://github.com/geerlingguy/kubernetes-101/issues/24

[geerlingguy]

Thanks! I'll be taking a look at this in my next pass through the text (working on the transcription into book form currently).

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[frob]

Tested this patch and it worked well.

The ingress is currently broken on a default install of drocker desktop or minikube on macos without this fix.

[porkbrain]

Let me know if there's something you'd like to me to update before merging this PR.

[geerlingguy]

I'll get to it soon™, don't worry :)

If it's 'planned' then I definitely plan on having at it next go-round, but I have to sync the changes with the book text too, so I tend to batch these fixes together every few months.