fix: phase approval decision enum

Author: eisbilir

migrations/20210807_project_phase_approval_alter_decision.sql

@@ -0,0 +1,7 @@
+ALTER TYPE enum_project_phase_approval_decision RENAME TO enum_project_phase_approval_decision_old;
+
+CREATE TYPE "enum_project_phase_approval_decision" AS ENUM ('approve', 'reject');
+
+ALTER TABLE project_phase_approval  ALTER COLUMN "decision" TYPE "enum_project_phase_approval_decision" USING decision::text::enum_project_phase_approval_decision;
+
+DROP TYPE enum_project_phase_approval_decision_old;