Added JWT Auth

Wrote my own JWT auth middleware, since I could not get the go-chi middleware to accept a JWKS instead of a certificate.

helpers/jwtHelpers.go

@@ -0,0 +1,22 @@
+package helpers
+
+func JwtHasClaim(claims map[string]interface{}, role string) bool {
+	zitadelRoles, ok := claims["urn:zitadel:iam:org:project:roles"].(map[string]interface{})
+	if !ok {
+		return false
+	}
+	_, ok = zitadelRoles[role]
+	return ok
+}
+
+func GetJwtClaim(claims map[string]interface{}, role string) interface{} {
+	zitadelRoles, ok := claims["urn:zitadel:iam:org:project:roles"].(map[string]interface{})
+	if !ok {
+		return nil
+	}
+	claim, ok := zitadelRoles[role]
+	if !ok {
+		return nil
+	}
+	return claim
+}