add osg-upcoming-testing for rucio n2n plugin

var/local/mkosi/mkosi.default

 [Distribution]
-Distribution=centos
-Release=7
-Repositories=base
+Distribution=alma
+Release=8
+Repositories=BaseOS
 UseHostRepositories=True
 
 [Content]

var/local/mkosi/mkosi.extra/etc/pki/rpm-gpg/RPM-GPG-KEY-OSG

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+=f6aQ
+-----END PGP PUBLIC KEY BLOCK-----

var/local/mkosi/mkosi.extra/etc/pki/rpm-gpg/RPM-GPG-KEY-OSG-2

+-----BEGIN PGP PUBLIC KEY BLOCK-----
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var/local/mkosi/mkosi.extra/etc/yum.repos.d/osg-upcoming-testing.repo

+[osg-upcoming-testing]
+name=OSG Software for Enterprise Linux 8 - Upcoming Testing - $basearch
+#baseurl=https://repo.opensciencegrid.org/osg/3.5-upcoming/el8/testing/$basearch
+mirrorlist=https://repo.opensciencegrid.org/mirror/osg/3.5-upcoming/el8/testing/$basearch
+priority=98
+enabled=0
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG
+       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG-2
+
+[osg-upcoming-testing-source]
+name=OSG Software for Enterprise Linux 8 - Upcoming Testing - $basearch - Source
+baseurl=https://repo.opensciencegrid.org/osg/3.5-upcoming/el8/testing/source/SRPMS
+priority=98
+enabled=0
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG
+       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG-2
+
+[osg-upcoming-testing-debuginfo]
+name=OSG Software for Enterprise Linux 8 - Upcoming Testing - $basearch - Debug
+baseurl=https://repo.opensciencegrid.org/osg/3.5-upcoming/el8/testing/$basearch/debug
+priority=98
+enabled=0
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG
+       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSG-2
+

var/local/mkosi/mkosi.postinst

 #!/bin/bash
 
-yum install -y --releasever=7 \
+yum install -y \
     curl \
     gperftools \
     hostname \
@@ -14,8 +14,7 @@ yum install -y --releasever=7 \
     fetch-crl \
     gdb \
     yum-utils \
-    python-requests \
     python3 \
     python3-requests
 
-yum --releasever=7 --disablerepo="*" --enablerepo="osg-upcoming-testing" install -y xrootd-rucioN2N-for-Xcache
+yum --disablerepo="*" --enablerepo="osg-upcoming-testing" install -y xrootd-rucioN2N-for-Xcache