ci(rpm): update RPM builder to avoid transient mirrors

.gitea/workflows/release.yml

@@ -312,7 +312,13 @@ jobs:
             rockylinux:9 \
             bash -lc "
               set -euo pipefail
-              dnf install -y rpm-build git &&
+              # Avoid transient/out-of-sync mirrors while bootstrapping the RPM builder.
+              sed -i \
+                -e 's|^mirrorlist=|#mirrorlist=|' \
+                -e 's|^#baseurl=http://dl.rockylinux.org|baseurl=https://dl.rockylinux.org|' \
+                /etc/yum.repos.d/rocky*.repo
+              dnf clean all
+              dnf -y --setopt=timeout=60 --setopt=retries=5 install rpm-build git
               curl -fsSL https://go.dev/dl/go\${GO_VER}.linux-amd64.tar.gz | tar -C /usr/local -xz &&
               export PATH=\$PATH:/usr/local/go/bin &&
               mkdir -p ~/rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS} &&