Adapt Dockerfiles to RHEL-9 (#infra)

Dockerfiles were from F34. We want to leave them as close as possible but still
we need to change things like base container etc.

Main difference here is that we don't need to have ELN support in RHEL-9 so
remove these parts from Dockerfiles to simplify it.

dockerfile/anaconda-ci/Dockerfile

@@ -1,20 +1,15 @@
-ARG image=registry.fedoraproject.org/fedora:rawhide
+ARG image=registry-proxy.engineering.redhat.com/rh-osbs/ubi9:latest
 FROM ${image}
 # FROM starts a new build stage with new ARGs. Put any ARGs after FROM unless required by the FROM itself.
 # see https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact
-ARG git_branch=master
-ARG copr_repo=@rhinstaller/Anaconda
+ARG git_branch=rhel-9
+ARG copr_repo=rhinstaller-group/Anaconda
 LABEL [email protected]
 
-# On ELN, BaseOS+AppStream don't have all our build dependencies; this provides the "Everything" compose
-COPY ["eln.repo", "/etc/yum.repos.d"]
-
 # Prepare environment and install build dependencies
 RUN set -e; \
-  if grep -q VARIANT.*eln /etc/os-release; then sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/eln.repo; fi; \
   dnf update -y; \
   dnf install -y \
-  'dnf-command(copr)' \
   curl \
   /usr/bin/xargs \
   rpm-build \
@@ -32,7 +27,6 @@ RUN set -e; \
   policycoreutils \
   python3-gobject-base \
   python3-pip; \
-  if ! grep -q VARIANT.*eln /etc/os-release; then dnf copr enable -y ${copr_repo}; dnf copr enable -y @storage/blivet-daily; fi; \
   curl -L https://raw.githubusercontent.com/rhinstaller/anaconda/${git_branch}/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 --requires /tmp/anaconda.spec | grep -v anaconda | xargs -d '\n' dnf install -y; \

dockerfile/anaconda-rpm/Dockerfile

@@ -1,25 +1,19 @@
-ARG image=registry.fedoraproject.org/fedora:rawhide
+ARG image=registry-proxy.engineering.redhat.com/rh-osbs/ubi9:latest
 FROM ${image}
 # FROM starts a new build stage with new ARGs. Put any ARGs after FROM unless required by the FROM itself.
 # see https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact
-ARG git_branch=master
-ARG copr_repo=@rhinstaller/Anaconda
+ARG git_branch=rhel-9
+ARG copr_repo=rhinstaller-group/Anaconda
 LABEL [email protected]
 
-# On ELN, BaseOS+AppStream don't have all our build dependencies; this provides the "Everything" compose
-COPY ["eln.repo", "/etc/yum.repos.d"]
-
 # Prepare environment and install build dependencies
 RUN set -e; \
-  if grep -q VARIANT.*eln /etc/os-release; then sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/eln.repo; fi; \
   dnf update -y; \
   dnf install -y \
-  'dnf-command(copr)' \
   curl \
   python3-pip \
   /usr/bin/xargs \
   rpm-build; \
-  if ! grep -q VARIANT.*eln /etc/os-release; then dnf copr enable -y ${copr_repo}; dnf copr enable -y @storage/blivet-daily; fi; \
   curl -L https://raw.githubusercontent.com/rhinstaller/anaconda/${git_branch}/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; \
   mkdir /anaconda