Allow overriding os and architecture when watching

Move insecure_tls and timeout options to registry option
Rename Bolt bucket
Change default schedule
Review registry client

internal/model/watch.go

@@ -3,4 +3,6 @@ package model
 // Watch holds data necessary for watch configuration
 type Watch struct {
 	Schedule string `yaml:"schedule,omitempty"`
+	Os       string `yaml:"os,omitempty"`
+	Arch     string `yaml:"arch,omitempty"`
 }