diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e5b1e4807a59754b9280448ddd7adab49f9b6336..d5d6db61757c757c5c50fbcef6df4e4794704d55 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@ image: docker:20.10.9
 
 variables:
   DOCKER_TLS_CERTDIR: "/certs"
-  BUILD_VERSION: p3
+  BUILD_VERSION: p4
 
 services:
   - docker:20.10.9-dind
diff --git a/Dockerfile b/Dockerfile
index 9c2694165bd812f4593dddeead55d1f058124185..38823b0e6206d88431a87abc9890118ccc21bd1a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,6 @@ RUN set -ex; \
 
 COPY entrypoint.sh entrypoint.sh
 ADD mod_auth_mellon.conf /etc/apache2/conf-enabled/mod_auth_mellon.conf
-RUN a2ensite default-ssl; a2enmod headers rewrite remoteip ssl
+RUN a2ensite default-ssl; a2enmod headers rewrite remoteip ssl;usermod -a -G ssl-cert www-data
 
 USER www-data