builder/digitalocean: region supports vars [GH-1452]

CHANGELOG.md

@@ -8,6 +8,7 @@ IMPROVEMENTS:
 
   * builder/amazon-instance: EBS AMIs can be used as a source. [GH-1453]
   * builder/digitalocean: Can set API URL endpoint. [GH-1448]
+  * builder/digitalocean: Region supports variables. [GH-1452]
   * builder/parallels/all Path to tools ISO is calculated automatically. [GH-1455]
   * builder/qemu: Can specify "none" acceleration type. [GH-1395]
   * builder/qemu: Can specify "tcg" acceleration type. [GH-1395]

builder/digitalocean/builder.go

@@ -158,6 +158,9 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	}
 
 	templates := map[string]*string{
+		"region":        &b.config.Region,
+		"size":          &b.config.Size,
+		"image":         &b.config.Image,
 		"client_id":     &b.config.ClientID,
 		"api_key":       &b.config.APIKey,
 		"api_url":       &b.config.APIURL,