Insecure startup of OS in datanode only if explicitly configured (#16108)

* Insecure startup of OS in datanode only if explicitly configured

* Data node can be started without starting OS, just to be discovered by pre-flight mode

data-node/src/main/java/org/graylog/datanode/Configuration.java

@@ -61,6 +61,9 @@ public class Configuration extends BaseConfiguration {
     @Parameter(value = "installation_source", validator = StringNotBlankValidator.class)
     private String installationSource = "unknown";
 
+    @Parameter(value = "insecure_startup")
+    private boolean insecureStartup = false;
+
     @Parameter(value = "skip_preflight_checks")
     private boolean skipPreflightChecks = false;
 
@@ -129,6 +132,10 @@ public class Configuration extends BaseConfiguration {
     @Parameter(value = "user_password_bcrypt_salt_size", validators = PositiveIntegerValidator.class)
     private int userPasswordBCryptSaltSize = 10;
 
+    public boolean isInsecureStartup() {
+        return insecureStartup;
+    }
+
     public Integer getStaleLeaderTimeout() {
         return staleLeaderTimeout;
     }