make ip version configurable

internal/config/config.go

@@ -23,6 +23,7 @@ type Config = struct {
 	HcloudRegion            string `default:"" env:"WOODPECKER_AUTOSCALER_HCLOUD_REGION"`
 	HcloudDatacenter        string `default:"" env:"WOODPECKER_AUTOSCALER_HCLOUD_DATACENTER"`
 	HcloudSSHKeys           string `default:"" env:"WOODPECKER_AUTOSCALER_HCLOUD_SSH_KEYS"`
+	HcloudIPv6Only          bool   `default:"false" env:"WOODPECKER_AUTOSCALER_HCLOUD_IPV6_ONLY"`
 }
 
 func GenConfig() (cfg *Config, err error) {

internal/hetzner/hetzneragent.go

@@ -94,7 +94,7 @@ func CreateNewAgent(cfg *config.Config) (*hcloud.Server, error) {
 	}
 
 	networkConf := hcloud.ServerCreatePublicNet{
-		EnableIPv4: false,
+		EnableIPv4: !cfg.HcloudIPv6Only,
 		EnableIPv6: true,
 	}