diff --git a/Dockerfile b/Dockerfile
index 154a623..08c9a90 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -263,4 +263,7 @@ COPY setup/phpunit/problem-matcher.json /etc/laminas-ci/problem-matcher/phpunit.
 
 RUN useradd -ms /bin/bash testuser
 
+# Copy ubuntu setup
+COPY setup/ubuntu /
+
 ENTRYPOINT ["entrypoint.sh"]
diff --git a/setup/ubuntu/etc/security/limits.d/testuser.conf b/setup/ubuntu/etc/security/limits.d/testuser.conf
new file mode 100644
index 0000000..4d71452
--- /dev/null
+++ b/setup/ubuntu/etc/security/limits.d/testuser.conf
@@ -0,0 +1,2 @@
+testuser soft nofile 1048576
+testuser hard nofile 1048576