Share NBResource between different routes (#149)

This changes the behavior of the Netbird resource so that they can be
shared between routes rather than having one unique created per route.
This is important as we may want to have different route types pointing
to the same service.

Signed-off-by: Philip Laine <philip.laine@gmail.com>

examples/gateway-api-public/README.md

@@ -0,0 +1,39 @@
+# Gateway API (Public)
+
+This example walks you through how to setup a Netbird Gateway API and expose Nginx through the Netbird proxy service.
+
+Build image locally and load it into Kind.
+```shell
+make docker-build IMG=docker.io/netbirdio/kubernetes-operator:dev
+kind load docker-image docker.io/netbirdio/kubernetes-operator:dev
+```
+
+Install the Gateway API CRDs.
+
+```shell
+kubectl apply --server-side -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.5.0/standard-install.yaml
+```
+
+Create Netbird namespace and API key secret.
+```shell
+kubectl create namespace netbird
+kubectl -n netbird create secret generic netbird-mgmt-api-key --from-literal NB_API_KEY=${NETBIRD_API_KEY}
+```
+
+Install the Kubernetes Operator. Make sure to use the customized values to enable Gateway API support. This assumes you have already created a secret containing a Netbird API key.
+
+```shell
+helm upgrade --install --create-namespace -f ./examples/gateway-api-public/values.yaml -n netbird netbird-operator ./helm/kubernetes-operator
+```
+
+Create the gateway along with the routing peer. This will deploy Netbird clients that route traffic into the cluster.
+
+```shell
+kubectl apply -f ./examples/gateway-api-public/gateway.yaml
+```
+
+Deploy the test Nginx application along with a HTTPRoute. The HTTPRoute will expose the service through Netbirds public proxy.
+
+```shell
+kubectl apply -f ./examples/gateway-api-public/nginx.yaml
+```