keycloak: add generated password legth unit test

ozgcloud-keycloak-operator/src/test/java/de/ozgcloud/operator/keycloak/user/UserSecretBuilderTest.java

@@ -102,6 +102,13 @@ class UserSecretBuilderTest {
 				assertThat(password).isAlphanumeric();
 			}
 
+			@Test
+			void shouldHaveMiminumLength() {
+				var password = decode(builder.generatePassword());
+
+				assertThat(password).hasSize(8);
+			}
+
 			@Test
 			void shouldEncode() {
 				builder.generatePassword();