Workaround 2142849.

Observed as
www_1                  | lasso:ERROR:tools.c:586:lasso_query_sign: assertion failed: (rsa)
Error GETing http://www:8079/saml-redirect-uri/login?ReturnTo=http%3A%2F%2Fwww%3A8079%2Fadmin%2Flogin%2F%3Fnext%3D%2Fadmin%2F&IdP=http%3A%2F%2Fkeycloak%3A8082%2Frealms%2Frealm%2Db: Server closed connection without sending any data back at /test.pl line 21.
ERROR: 255
www_1                  | [Thu Apr 20 08:43:17.794155 2023] [core:notice] [pid 15:tid 15] AH00051: child pid 18 exit signal Abort (6), possible coredump in /etc/httpd

tests/Dockerfile.httpd

@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora
+FROM registry.fedoraproject.org/fedora:37
 RUN dnf install -y httpd mod_auth_openidc mod_auth_mellon && dnf clean all
 COPY mod_auth_openidc_keycloak.conf mod_auth_mellon_keycloak.conf /etc/httpd/conf.d/
 RUN sed -i -e '/^Listen/aListen 8079' -e 's/^Listen 80/Listen 8080/' /etc/httpd/conf/httpd.conf