[FEATURE] Upgrade Gerrit to 3.2.5 based on Ubuntu 20 and use PHP 7.4

Dockerfile

-FROM gerritcodereview/gerrit:3.0.13-ubuntu18
+FROM gerritcodereview/gerrit:3.2.5-ubuntu20
 
 # Add PHP for hooks
 
@@ -6,7 +6,7 @@ USER root
 
 RUN export DEBIAN_FRONTEND=noninteractive \
  && apt-get update \
- && apt-get install --yes --no-install-recommends php7.2-cli php7.2-curl \
+ && apt-get install --yes --no-install-recommends php7.4-cli php7.4-curl \
  && apt-get clean \
  && ln -fs /usr/share/zoneinfo/Europe/Berlin /etc/localtime \
  && dpkg-reconfigure --frontend noninteractive tzdata \

assets/etc/gerrit.config

@@ -61,6 +61,9 @@
 	listenAddress = *:29418
 	threads = 12
 
+[plugins]
+    allowRemoteAdmin = false
+
 [sendemail]
 	smtpServer = mail.typo3.org
 	smtpEncryption = ssl