Updated Gentoo conf path and binhost name

[radarhere]

Gentoo has started failing in main - https://github.com/python-pillow/docker-images/actions/runs/6477775709/job/17588504307

A line to append config to a file

docker-images/gentoo/Dockerfile

Line 10 in 5695487

RUN echo -e "[binhost]\npriority = 9999\nsync-uri = https://gentoo.osuosl.org/experimental/amd64/binpkg/default/linux/17.1/x86-64/\n" | cat >> /etc/portage/binrepos.conf

is causing https://github.com/python-pillow/docker-images/actions/runs/6477775709/job/17588504307#step:6:60

0.308 /bin/sh: line 1: /etc/portage/binrepos.conf: Is a directory

Looking inside that directory, I see

gentoobinhost.conf

However, just updating our conf path to this new location isn't sufficient - it produces a variety of "Invalid binary package" messages.

Getting the contents of the new conf file, I see

# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consider using a local mirror.

[gentoobinhost]
priority = 1
sync-uri = https://gentoo.osuosl.org/releases/amd64/binpackages/17.1/x86-64

Our command uses 'binhost', this new conf file uses 'gentoobinhost'.

Updating both that name and the conf path resolves the problem.

[hugovk]

Thanks!