feat: add plan workflow

- update makefile to enable kubernetes auth or roleid auth
- add plan workflow
- update all policies to allow the terraform-vault kubernetes role

Makefile

@@ -1,9 +1,18 @@
 .PHONY: init plan apply format
 
+VAULT_AUTH_METHOD ?= approle
+VAULT_K8S_ROLE ?= woodpecker_terraform_vault
+VAULT_K8S_MOUNT ?= auth/k8s/au/syd1
+VAULT_K8S_JWT_PATH ?= /var/run/secrets/kubernetes.io/serviceaccount/token
+
 # Define vault_env function to set up vault environment
 define vault_env
 	@export VAULT_ADDR="https://vault.service.consul:8200" && \
-	export VAULT_TOKEN=$$(vault write -field=token auth/approle/login role_id=$$VAULT_ROLEID) && \
+	if [ "$(VAULT_AUTH_METHOD)" = "kubernetes" ]; then \
+		export VAULT_TOKEN=$$(vault write -field=token $(VAULT_K8S_MOUNT)/login role=$(VAULT_K8S_ROLE) jwt=$$(cat $(VAULT_K8S_JWT_PATH))); \
+	else \
+		export VAULT_TOKEN=$$(vault write -field=token auth/approle/login role_id=$$VAULT_ROLEID); \
+	fi && \
 	export CONSUL_HTTP_TOKEN=$$(vault read -format=json consul_root/au/syd1/creds/terraform-vault | jq '.data.token')
 endef