chore(docker): use the full name of registry

duanhongyi · duanhongyi · commit a8e1ea6b9207 · 2021-01-12T15:13:43.000+08:00
diff --git a/rootfs/Dockerfile b/rootfs/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.15
+FROM docker.io/library/golang:1.15
 
 LABEL name="drycc-go-dev"
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM golang:1.15`
	`1`	`+FROM docker.io/library/golang:1.15`
`2`	`2`
`3`	`3`	`LABEL name="drycc-go-dev"`
`4`	`4`