Do not require best packages for anaconda container builds

The issue this patch is trying to resolve is older version of package in
developemnt CentOS repository than in the production CentOS repository.
For example for gtk package:

Error:
 Problem 1: package gtk3-devel-docs-3.24.43-2.el10.x86_64 from
crb-development requires gtk3 = 3.24.43-2.el10, but none of the
providers can be installed
  - cannot install both gtk3-3.24.43-3.el10.x86_64 from appstream and
    gtk3-3.24.43-2.el10.x86_64 from appstream-development
  - cannot install both gtk3-3.24.43-3.el10.x86_64 from appstream and
    gtk3-3.24.43-2.el10.x86_64 from appstream
  - package gtk3-devel-3.24.43-3.el10.x86_64 from appstream requires
    gtk3(x86-64) = 3.24.43-3.el10, but none of the providers can be
installed
  - cannot install the best candidate for the job
  - conflicting requests

dockerfile/anaconda-rpm/Dockerfile

@@ -42,7 +42,7 @@ RUN set -ex; \
   python3-pip \
   rpm-build; \
   cat /root/anaconda.spec.in | sed 's/@PACKAGE_VERSION@/0/; s/@PACKAGE_RELEASE@/0/; s/%{__python3}/python3/' > /tmp/anaconda.spec; \
-  rpmspec -q --buildrequires /tmp/anaconda.spec | xargs -d '\n' dnf install -y; \
+  rpmspec -q --buildrequires /tmp/anaconda.spec | xargs -d '\n' dnf install --nobest -y; \
   dnf clean all; \
   mkdir /anaconda