add `use` field to .well-known/jwks for oidc

Dear support,

I tried to integrate spacelift with aliyun oidc, (i understand this is not official documented), and it failed at checking oidc discovery of the issuer url. According to aliyun support, it is likely because the keys in

.well-known/jwks has no “use” filed. I understand that this field is optional in spec, but it could help to support aliyun if the field is presented. Thanks