feat: add openresty proxy implementation

This plugin is mostly compatible with the nginx plugin, but runs the proxy within a docker container. Users do not have direct access to add custom openresty configuration at this time, but instead receive the ability to setup automatic ssl on first request via letsencrypt integration.

plugins/common/subprocess.go

@@ -124,6 +124,12 @@ func PlugnTriggerOutput(triggerName string, args ...string) ([]byte, error) {
 	return readStdout, err
 }
 
+// PlugnTriggerOutputAsString fires the given plugn trigger with the given args and returns the string contents instead of bytes
+func PlugnTriggerOutputAsString(triggerName string, args ...string) (string, error) {
+	b, err := PlugnTriggerOutput(triggerName, args...)
+	return strings.TrimSpace(string(b[:])), err
+}
+
 // PlugnTriggerSetup sets up a plugn trigger call
 func PlugnTriggerSetup(triggerName string, args ...string) *sh.Session {
 	shellArgs := make([]interface{}, len(args)+2)