ci/cd: add basic static analysis for backend (#389)

backend/internal/service/oidc_service.go

@@ -492,6 +492,7 @@ func (s *OidcService) GetUserClaimsForClient(userID string, clientID string) (ma
 		for _, customClaim := range customClaims {
 			// The value of the custom claim can be a JSON object or a string
 			var jsonValue interface{}
+			//nolint:errcheck // Ignore error for JSON unmarshalling
 			json.Unmarshal([]byte(customClaim.Value), &jsonValue)
 			if jsonValue != nil {
 				// It's JSON so we store it as an object