Upgrade the alamalinux image to version 9.0

Change-Id: I73ccf2f994bd4b0dc658d21769201b455f4e1640
diff --git a/README.md b/README.md
index e1adfbf..9181cea 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@
 git checkout v3.3.0
 ```
 
-Navigate to either `./almalinux/8` or `./ubuntu/22` to build the almalinux- or ubuntu-based docker
+Navigate to either `./almalinux/9` or `./ubuntu/22` to build the almalinux- or ubuntu-based docker
 image, respectively. Then run:
 
 ```
diff --git a/almalinux/8/Dockerfile b/almalinux/9/Dockerfile
similarity index 97%
rename from almalinux/8/Dockerfile
rename to almalinux/9/Dockerfile
index 7d48d71..b2465fa 100644
--- a/almalinux/8/Dockerfile
+++ b/almalinux/9/Dockerfile
@@ -1,4 +1,4 @@
-FROM almalinux:8.6
+FROM almalinux:9.0
 MAINTAINER Gerrit Code Review Community
 
 # Add Gerrit packages repository
diff --git a/almalinux/8/Dockerfile-dev b/almalinux/9/Dockerfile-dev
similarity index 98%
rename from almalinux/8/Dockerfile-dev
rename to almalinux/9/Dockerfile-dev
index 0b73848..a8dda99 100644
--- a/almalinux/8/Dockerfile-dev
+++ b/almalinux/9/Dockerfile-dev
@@ -1,4 +1,4 @@
-FROM almalinux:8.5
+FROM almalinux:9.0
 MAINTAINER Gerrit Code Review Community
 
 ARG GERRIT_WAR_URL="https://gerrit-ci.gerritforge.com/view/Gerrit/job/Gerrit-bazel-master/lastSuccessfulBuild/artifact/gerrit/bazel-bin/release.war"
diff --git a/almalinux/8/entrypoint.sh b/almalinux/9/entrypoint.sh
similarity index 100%
rename from almalinux/8/entrypoint.sh
rename to almalinux/9/entrypoint.sh