🐛 Use AlmaLinux 8 instead of CentOS 8 Stream Vault (minio#320)

Switch to Alma. The CentOS 8 Stream Vault metadata seems to be broken.
The postgres:15 module is unavailable and builds are still breaking.
I've beem locally with Alma and it works. They also support all
architectures for AlmaLinux 8. Rocky and others are lacking, at least
according to this chart:
https://wiki.almalinux.org/Comparison.html

Signed-off-by: Jason Montleon <jmontleo@redhat.com>

Dockerfile

@@ -5,11 +5,11 @@ USER 0
 COPY tools/upgrades/migrate-pathfinder-assessments.py /usr/local/bin/migrate-pathfinder-assessments.py
 COPY tools/upgrades/jwt.sh /usr/local/bin/jwt.sh
 RUN dnf -y install openssl && dnf clean all
-RUN echo -e "[centos8-appstream]" \
- "\nname = centos8-appstream" \
- "\nbaseurl = https://vault.centos.org/8-stream/AppStream/x86_64/os/" \
+RUN echo -e "[almalinux8-appstream]" \
+ "\nname = almalinux8-appstream" \
+ "\nbaseurl = https://repo.almalinux.org/almalinux/8/AppStream/x86_64/os/" \
  "\nenabled = 1" \
- "\ngpgcheck = 0" > /etc/yum.repos.d/centos.repo
+ "\ngpgcheck = 0" > /etc/yum.repos.d/almalinux.repo
 RUN dnf -y module enable postgresql:15 && dnf -y install postgresql && dnf clean all
 USER 1001