`nginx:mainline` module stream is missing

[mb-shorai]

Hi, I'm following https://docs.rockylinux.org/guides/web/nginx-mainline/#installing-the-repository-enabling-the-module and I cannot enable the mainline stream:

❯ docker run --rm -it --pull=always rockylinux:9
9: Pulling from library/rockylinux
Digest: sha256:c944604c0c759f5d164ffbdf0bbab2fac582b739938937403c067ab634a0518a
Status: Image is up to date for rockylinux:9

[root@0cd2baf32f51 /]# dnf update -yq
Importing GPG key 0x350D275D:
 Userid     : "Rocky Enterprise Software Foundation - Release key 2022 <[email protected]>"
 Fingerprint: 21CB 256A E16F C54C 6E65 2949 702D 426D 350D 275D
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-Rocky-9

Upgraded:
  gnutls-3.7.6-23.el9_3.3.x86_64            libxml2-2.9.13-5.el9_3.x86_64           openssl-1:3.0.7-25.el9_3.x86_64
  openssl-libs-1:3.0.7-25.el9_3.x86_64      python3-3.9.18-1.el9_3.1.x86_64         python3-libs-3.9.18-1.el9_3.1.x86_64
  python3-rpm-4.16.1.3-27.el9_3.x86_64      rocky-gpg-keys-9.3-1.2.el9.noarch       rocky-release-9.3-1.2.el9.noarch
  rocky-repos-9.3-1.2.el9.noarch            rpm-4.16.1.3-27.el9_3.x86_64            rpm-build-libs-4.16.1.3-27.el9_3.x86_64
  rpm-libs-4.16.1.3-27.el9_3.x86_64         rpm-sign-libs-4.16.1.3-27.el9_3.x86_64  sqlite-libs-3.34.1-7.el9_3.x86_64
  systemd-libs-252-18.el9.0.1.rocky.x86_64  tzdata-2024a-1.el9.noarch

[root@0cd2baf32f51 /]# dnf install epel-release -yq

Installed:
  dbus-libs-1:1.12.20-8.el9.x86_64                      dnf-plugins-core-4.3.0-11.el9_3.noarch
  epel-release-9-7.el9.noarch                           python3-dateutil-1:2.8.1-7.el9.noarch
  python3-dbus-1.2.18-2.el9.x86_64                      python3-dnf-plugins-core-4.3.0-11.el9_3.noarch
  python3-six-1.15.0-9.el9.noarch                       python3-systemd-234-18.el9.x86_64

[root@0cd2baf32f51 /]# dnf module enable nginx:mainline
Extra Packages for Enterprise Linux 9 - x86_64                                              8.8 MB/s |  20 MB     00:02
Extra Packages for Enterprise Linux 9 openh264 (From Cisco) - x86_64                        1.3 kB/s | 2.5 kB     00:01
Error: Problems in request:
missing groups or modules: nginx:mainline

[root@0cd2baf32f51 /]# dnf module list nginx
Last metadata expiration check: 0:00:27 ago on Wed Feb 28 16:20:42 2024.
Rocky Linux 9 - AppStream
Name                        Stream                      Profiles                        Summary
nginx                       1.22                        common [d]                      nginx webserver

Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled

I've found https://github.com/rocky-linux/documentation/issues/605, but epel-release is already there. Am I missing something?