fix: default options on startup

Fixes #244

The problem was that the default value was unused unless passed
explicitly via the flag.

Fix by exposing the registry refresh interval, but also ensure that
options defaults are set even if they don't have a flag.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

cmd/image-factory/flags.go

@@ -12,14 +12,16 @@ import (
 )
 
 func initFlags() cmd.Options {
-	var opts cmd.Options
+	opts := cmd.DefaultOptions
 
 	flag.StringVar(&opts.HTTPListenAddr, "http-port", cmd.DefaultOptions.HTTPListenAddr, "HTTP listen address")
 
 	flag.StringVar(&opts.MinTalosVersion, "min-talos-version", cmd.DefaultOptions.MinTalosVersion, "minimum Talos version")
 	flag.StringVar(&opts.ImageRegistry, "image-registry", cmd.DefaultOptions.ImageRegistry, "image registry for imager, extensions, etc.")
 	flag.BoolVar(&opts.InsecureImageRegistry, "insecure-image-registry", cmd.DefaultOptions.InsecureImageRegistry, "allow an insecure connection to the image registry")
 
+	flag.DurationVar(&opts.RegistryRefreshInterval, "registry-refresh-interval", cmd.DefaultOptions.RegistryRefreshInterval, "image registry refresh interval")
+
 	flag.StringVar(&opts.ContainerSignatureSubjectRegExp, "container-signature-subject-regexp", cmd.DefaultOptions.ContainerSignatureSubjectRegExp, "container signature subject regexp")
 	flag.StringVar(&opts.ContainerSignatureIssuerRegExp, "container-signature-issuer-regexp", cmd.DefaultOptions.ContainerSignatureIssuerRegExp, "container signature issuer regexp")
 	flag.StringVar(&opts.ContainerSignatureIssuer, "container-signature-issuer", cmd.DefaultOptions.ContainerSignatureIssuer, "container signature issuer")