The mount path of the Vault PKI secrets engine (default: pki).
Use a custom value if you have multiple PKI engines mounted at different paths, e.g.
pki-intermediate or pki-root. Nested mounts such as
teams/a/pki are supported; allowed characters are letters, digits,
-, _ and . (no ./.. segments).
Vault policy example:
path "<mount>/issue/<role>" {
capabilities = ["create", "update"]
}