add possibility to turn on ECR image scanning for repos created by ec…

…r plugin

cmd/drone-ecr/main.go

@@ -37,6 +37,7 @@ func main() {
 		lifecyclePolicy  = getenv("PLUGIN_LIFECYCLE_POLICY")
 		repositoryPolicy = getenv("PLUGIN_REPOSITORY_POLICY")
 		assumeRole       = getenv("PLUGIN_ASSUME_ROLE")
+		scanOnPush       = parseBoolOrDefault(false, getenv("PLUGIN_SCAN_ON_PUSH"))
 	)
 
 	// set the region
@@ -72,7 +73,7 @@ func main() {
 	}
 
 	if create {
-		err = ensureRepoExists(svc, trimHostname(repo, registry))
+		err = ensureRepoExists(svc, trimHostname(repo, registry), scanOnPush)
 		if err != nil {
 			log.Fatal(fmt.Sprintf("error creating ECR repo: %v", err))
 		}
@@ -118,9 +119,10 @@ func trimHostname(repo, registry string) string {
 	return repo
 }
 
-func ensureRepoExists(svc *ecr.ECR, name string) (err error) {
+func ensureRepoExists(svc *ecr.ECR, name string, scanOnPush bool) (err error) {
 	input := &ecr.CreateRepositoryInput{}
 	input.SetRepositoryName(name)
+	input.SetImageScanningConfiguration(&ecr.ImageScanningConfiguration{ScanOnPush: &scanOnPush})
 	_, err = svc.CreateRepository(input)
 	if err != nil {
 		if aerr, ok := err.(awserr.Error); ok && aerr.Code() == ecr.ErrCodeRepositoryAlreadyExistsException {