♻️(helm) extract make command in a script

Existing make command wasn't working on Mac. Fixed it, plus
refactored it in a proper script, so we can share it among
projects, as for the build kind cluster one.

External secrets are created in a dedicated namespace, to avoid
duplicating them if we spawn several LaSuite applications on the
same local stack.

Makefile

@@ -301,34 +301,8 @@ build-k8s-cluster: ## build the kubernetes cluster using kind
 	./bin/start-kind.sh
 .PHONY: build-k8s-cluster
 
-install-secret: ## install the kubernetes secrets from Vaultwarden
-	if kubectl -n meet get secrets bitwarden-cli-visio; then \
-		echo "Secret already present"; \
-	else \
-		echo "Please provide the following information:"; \
-		read -p "Enter your vaultwarden email login: " LOGIN; \
-		read -p "Enter your vaultwarden password: " PASSWORD; \
-		read -p "Enter your vaultwarden server url: " URL; \
-		echo "\nCreate vaultwarden secret"; \
-		echo "apiVersion: v1" > /tmp/secret.yaml; \
-		echo "kind: Secret" >> /tmp/secret.yaml; \
-		echo "metadata:" >> /tmp/secret.yaml; \
-		echo "  name: bitwarden-cli-visio" >> /tmp/secret.yaml; \
-		echo "  namespace: meet" >> /tmp/secret.yaml; \
-		echo "type: Opaque" >> /tmp/secret.yaml; \
-		echo "stringData:" >> /tmp/secret.yaml; \
-		echo "  BW_HOST: $$URL" >> /tmp/secret.yaml; \
-		echo "  BW_PASSWORD: $$PASSWORD" >> /tmp/secret.yaml; \
-		echo "  BW_USERNAME: $$LOGIN" >> /tmp/secret.yaml; \
-		kubectl -n meet apply -f /tmp/secret.yaml;\
-		rm -f /tmp/secret.yaml; \
-		helm repo add external-secrets https://charts.external-secrets.io; \
-		helm upgrade --install external-secrets \
-      external-secrets/external-secrets \
-       -n meet \
-       --create-namespace \
-       --set installCRDs=true; \
-	fi
+install-external-secrets: ## install the kubernetes secrets from Vaultwarden
+	./bin/install-external-secrets.sh
 .PHONY: build-k8s-cluster
 
 start-tilt: ## start the kubernetes cluster using kind