Allow setting metallb CIDR value for local env

The default CIDR value (/28) allows for 16 ips to be assigned which is
fine for the majority of dev/test/demo needs. However, when trying to
test at scale it is useful to be able to create more Gateways on a
single cluster and therefore more IPs can be required.

Changes here allow the CIDR and number of IP values used by the local
setup script to be set as required, default is the same as before (/28 &
16 IPs).

```
make local-setup SUBNET_OFFSET=0 CIDR=26 NUM_IPS=64
```

Signed-off-by: Michael Nairn <[email protected]>

make/development-environments.mk

@@ -8,12 +8,14 @@ uninstall: manifests kustomize ## Uninstall CRDs from the K8s cluster specified
 	$(KUSTOMIZE) build config/crd | kubectl delete -f -
 
 .PHONY: install-metallb
-install-metallb: SUBNET_OFFSET=1
+install-metallb: SUBNET_OFFSET=0
+install-metallb: CIDR=28
+install-metallb: NUM_IPS=16
 install-metallb: kustomize yq ## Installs the metallb load balancer allowing use of an LoadBalancer type with a gateway
 	$(KUSTOMIZE) build config/metallb | kubectl apply -f -
 	kubectl -n metallb-system wait --for=condition=Available deployments controller --timeout=300s
 	kubectl -n metallb-system wait --for=condition=ready pod --selector=app=metallb --timeout=60s
-	./utils/docker-network-ipaddresspool.sh kind $(YQ) ${SUBNET_OFFSET} | kubectl apply -n metallb-system -f -
+	./utils/docker-network-ipaddresspool.sh kind $(YQ) ${SUBNET_OFFSET} ${CIDR} ${NUM_IPS} | kubectl apply -n metallb-system -f -
 
 .PHONY: uninstall-metallb
 uninstall-metallb: $(KUSTOMIZE)

utils/docker-network-ipaddresspool.sh

@@ -11,8 +11,8 @@ set -euo pipefail
 networkName=$1
 YQ="${2:-yq}"
 offset=${3:-0}
-cidr=28
-numIPs=16
+cidr=${4:-28}
+numIPs=${5:-16}
 
 ## Parse kind network subnet
 ## Take only IPv4 subnets, exclude IPv6