更新 'defaults'

defaults

 {
-    "docker": "registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/bamreadcount:v0.8.0",
+    "fa": "GRCh38.d1.vd1.fa",
+    "ref_dir": "oss://pgx-reference-data/GRCh38.d1.vd1/"
+	"docker": "registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/bamreadcount:v0.8.0",
     "disk_size": "200",
     "cluster_config": "OnDemand bcs.b2.3xlarge img-ubuntu-vpc"
 }