BUG #19058: Empty repomd.xml.asc file

The following bug has been logged on the website:

Bug reference:      19058
Logged by:          Balasankar C
Email address:      postgresql@balasankarc.in
PostgreSQL version: 17.6
Operating system:   RHEL 9
Description:

The repomd.xml.asc file at
https://ftp.postgresql.org/pub/repos/yum/common/redhat/rhel-9-aarch64/repodata/
is empty, causing the following error on updates

```
Error: Failed to download metadata for repo 'pgdg-common': repomd.xml GPG
signature verification error: gpgme_op_verify() error: No data
```