feat(ingress): add TLS configuration for staging hosts

Add TLS configuration for staging-shiny and staging-shiny-api 
hosts in the ingress resources. Create a new namespace for 
ingress-nginx to better organize resources. Update kustomization 
files to include new certificates and secrets. Streamline setup 
process with improved wait commands for pod readiness.

k8s/nginx/kustomization.yaml

@@ -0,0 +1,12 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- namespaces.yaml
+helmCharts:
+- name: ingress-nginx
+  namespace: ingress-nginx
+  includeCRDs: true
+  releaseName: ingress-nginx
+  repo: https://kubernetes.github.io/ingress-nginx
+  version: 4.14.1
+  valuesFile: https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/hack/manifest-templates/provider/kind/values.yaml

k8s/nginx/namespaces.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ingress-nginx