Update GerritForge's GPG key for RPM/DEB packages

The new GerritForge's keys for native packages are published to
keyserver.ubuntu.com (keyid=55787ed781304950) and associated with the
gerrit@gerritforge.com identity.

Change-Id: I9128d7a73b29af5aa4f623ea70dcb8ed2e61424d

almalinux/9/Dockerfile

diff --git a/almalinux/9/Dockerfile b/almalinux/9/Dockerfile
index aca1c2e..b7d406f 100644
--- a/almalinux/9/Dockerfile
+++ b/almalinux/9/Dockerfile
@@ -1,8 +1,9 @@
 FROM almalinux:9.2
 MAINTAINER Gerrit Code Review Community
 
-# Add Gerrit packages repository
+# Add Gerrit packages repository and the newest GPG key
 RUN rpm -i https://gerritforge.com/gerritforge-repo-1-4.noarch.rpm
+RUN rpm --import 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x72adb205736d7147da56e8c955787ed781304950'
 
 ADD entrypoint.sh /
 

ubuntu/22/Dockerfile

diff --git a/ubuntu/22/Dockerfile b/ubuntu/22/Dockerfile
index 1300bea..5e91e9d 100644
--- a/ubuntu/22/Dockerfile
+++ b/ubuntu/22/Dockerfile
@@ -5,7 +5,7 @@
 RUN apt-get update && \
     apt-get -y install gnupg2
 RUN echo "deb mirror://mirrorlist.gerritforge.com/bionic gerrit contrib" > /etc/apt/sources.list.d/GerritForge.list
-RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 847005AE619067D5
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 55787ed781304950
 
 RUN apt-get update
 RUN apt-key update