Cirrus CI for macOS branches 16 and 15 broken

The Cirrus CI for REL_16_STABLE and REL_15_STABLE for macOS is 
apparently broken right now.  Here is a log example:

[13:57:11.305] sh src/tools/ci/ci_macports_packages.sh \
[13:57:11.305]   ccache \
[13:57:11.305]   icu \
[13:57:11.305]   kerberos5 \
[13:57:11.305]   lz4 \
[13:57:11.305]   meson \
[13:57:11.305]   openldap \
[13:57:11.305]   openssl \
[13:57:11.305]   p5.34-io-tty \
[13:57:11.305]   p5.34-ipc-run \
[13:57:11.305]   python312 \
[13:57:11.305]   tcl \
[13:57:11.305]   zstd
[13:57:11.325] macOS major version: 14
[13:57:12.554] MacPorts package URL: 
https://github.com/macports/macports-base/releases/download/v2.9.3/MacPorts-2.9.3-14-Sonoma.pkg
[14:01:37.252] installer: Package name is MacPorts
[14:01:37.252] installer: Installing at base path /
[14:01:37.252] installer: The install was successful.
[14:01:37.257]
[14:01:37.257] real	4m23.837s
[14:01:37.257] user	0m0.385s
[14:01:37.257] sys	0m0.339s
[14:01:37.282] macportsuser root
[14:01:37.431] Error: /opt/local/bin/port: Failed to initialize 
MacPorts, sqlite error: attempt to write a readonly database (8) while 
executing query: CREATE INDEX registry.snapshot_file_id ON 
snapshot_files(id)
[14:01:37.599] Error: No ports matched the given expression


REL_17_STABLE and up are working.

I know there have been some changes recently to manage the OS version 
change.  Are these older branches expected to work?