Add SSH SFTP backend support

internal/config/defaults.go

@@ -25,11 +25,13 @@ const (
 func ApplyDefaults(cfg *Config) {
 	for pipelineIndex := range cfg.Pipelines {
 		pipeline := &cfg.Pipelines[pipelineIndex]
+		applyBackendDefaults(&pipeline.Source)
 		if pipeline.Validation.OnDigestMismatch == "" {
 			pipeline.Validation.OnDigestMismatch = ValidationActionFail
 		}
 		for destinationIndex := range pipeline.Destinations {
 			destination := &pipeline.Destinations[destinationIndex]
+			applyDestinationDefaults(destination)
 			if destination.Publish == nil {
 				destination.Publish = &PublishPolicy{Source: true}
 			}
@@ -48,3 +50,25 @@ func ApplyDefaults(cfg *Config) {
 		}
 	}
 }
+
+func applyBackendDefaults(backend *Backend) {
+	if backend.Backend == BackendSSH {
+		if backend.Port == 0 {
+			backend.Port = 22
+		}
+		if backend.SSH.HostKeyPolicy == "" {
+			backend.SSH.HostKeyPolicy = HostKeyPolicyAcceptNew
+		}
+	}
+}
+
+func applyDestinationDefaults(destination *Destination) {
+	if destination.Backend == BackendSSH {
+		if destination.Port == 0 {
+			destination.Port = 22
+		}
+		if destination.SSH.HostKeyPolicy == "" {
+			destination.SSH.HostKeyPolicy = HostKeyPolicyAcceptNew
+		}
+	}
+}