feat: add mutation to generate new jwt secret & keys

Resolves: #150

server/graph/schema.graphqls

@@ -131,6 +131,12 @@ type ValidateJWTTokenResponse {
 	is_valid: Boolean!
 }
 
+type GenerateJWTKeysResponse {
+	secret: String
+	public_key: String
+	private_key: String
+}
+
 input UpdateEnvInput {
 	ADMIN_SECRET: String
 	CUSTOM_ACCESS_TOKEN_SCRIPT: String
@@ -296,6 +302,10 @@ input ValidateJWTTokenInput {
 	roles: [String!]
 }
 
+input GenerateJWTKeysInput {
+	type: String!
+}
+
 type Mutation {
 	signup(params: SignUpInput!): AuthResponse!
 	login(params: LoginInput!): AuthResponse!
@@ -317,6 +327,7 @@ type Mutation {
 	_invite_members(params: InviteMemberInput!): Response!
 	_revoke_access(param: UpdateAccessInput!): Response!
 	_enable_access(param: UpdateAccessInput!): Response!
+	_generate_jwt_keys(params: GenerateJWTKeysInput!): GenerateJWTKeysResponse!
 }
 
 type Query {