Validate APP_KEY (#13171)

* Validate APP_KEY
key:rotate command to rotate keys, only rotates validation data for now

* fixes, swapped encrypters, not saving new value to db, check that key exists first

* add confirmation

* Option to generate new key, re-encrypt data and then save it to .env
A lot more text to try to prevent disaster.  Print out both keys 1-2 times.
Fix bug in EnvHelper (when key is commented but not empty)

* fix style

* oops, good phpstan

LibreNMS/Util/EnvHelper.php

@@ -90,8 +90,9 @@ class EnvHelper
 
             $value = self::escapeValue($value);
 
-            if (strpos($content, "$key=") !== false) {
-                // only replace ones that aren't already set for safety and uncomment
+            if (preg_match("/^(#$key=$|$key=)/m", $content)) {
+                // enter this block if we have commented and empty or uncommented key
+                // only replace ones that aren't already set to a value for safety and uncomment
                 // escape $ in the replacement
                 $content = preg_replace("/#?$key=\n/", addcslashes("$key=$value\n", '$'), $content);
             } else {