Support for podman local images (#1969)

* Updating GetCanonicalImageName to construct compatible image names for local podman images

* Fixing comment formatting

---------

Co-authored-by: Andrew Redmon <auggiedog@gmail.com>

utils/containers.go

@@ -19,6 +19,7 @@ func GetCanonicalImageName(imageName string) string {
 	//    alpine == docker.io/library/alpine:latest
 	//    foo/bar == docker.io/foo/bar:latest
 	//    foo.bar/baz == foo.bar/bar:latest
+	//    localhost/foo:bar == localhost/foo:bar
 	//    docker.elastic.co/elasticsearch/elasticsearch == docker.elastic.co/elasticsearch/elasticsearch:latest
 	canonicalImageName := imageName
 	slashCount := strings.Count(imageName, "/")
@@ -32,6 +33,9 @@ func GetCanonicalImageName(imageName string) string {
 		// case of foo.bar/baz
 		if strings.Contains(nameSplit[0], ".") {
 			canonicalImageName = imageName
+		} else if strings.Contains(nameSplit[0], "localhost") {
+			// case of localhost/foo:bar - podman prefixes local images with "localhost"
+			canonicalImageName = imageName
 		} else {
 			canonicalImageName = "docker.io/" + imageName
 		}