gentoo: get base building & testing package

Not yet testing the current repository state though.

Signed-off-by: Sam James <sam@gentoo.org>

gentoo/Dockerfile

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+FROM gentoo/stage3:desktop
+
+# Disable bits which don't work within Docker.
+RUN echo 'FEATURES="-ipc-sandbox -pid-sandbox -network-sandbox -usersandbox -mount-sandbox -sandbox"' | cat >> /etc/portage/make.conf
+# Speed things up a bit.
+RUN echo 'FEATURES="${FEATURES} parallel-install parallel-fetch -merge-sync"' | cat >> /etc/portage/make.conf
+
+# TODO: May be able to drop this once changed to desktop docker images?
+# https://dilfridge.blogspot.com/2021/09/experimental-binary-gentoo-package.html
+RUN echo -e "[binhost]\npriority = 9999\nsync-uri = https://gentoo.osuosl.org/experimental/amd64/binpkg/default/linux/17.1/x86-64/\n" | cat >> /etc/portage/binrepos.conf
+
+RUN echo 'EMERGE_DEFAULT_OPTS="--binpkg-respect-use=n --getbinpkg=y --autounmask-write --autounmask-continue --autounmask-keep-keywords=y --autounmask-use=y"' | cat >> /etc/portage/make.conf
+RUN echo 'USE="elogind -polkit"' | cat >> /etc/portage/make.conf
+RUN cat /etc/portage/make.conf                                                  
+
+RUN emerge-webrsync --quiet || true 
+RUN eselect news read --quiet all || true
+
+# Make sure everything is consistent first.
+RUN emerge --quiet -uDU @world
+
+# Install some useful bits.
+RUN emerge --quiet --oneshot --jobs=$(nproc) media-libs/libjpeg-turbo sys-libs/zlib app-text/ghostscript-gpl 
+
+# Try install as many of our (test) dependencies as possible with fewer flags on
+RUN emerge --quiet --oneshot --onlydeps --jobs=$(nproc) --with-test-deps dev-python/pillow || true
+
+# Then install the remaining (test) dependencies with more flags (because they clearly didn't get picked up before)
+# ... and these more flags are needed to run tests anyway.
+RUN USE="jpeg jpeg2k tiff truetype xvfb X elogind" emerge --quiet --oneshot --onlydeps --with-test-deps --getbinpkg=n dev-python/pillow
+
+# Actually build & run the tests.
+# TODO: change this to use the mounted version of Pillow (so the commit to be tested)
+RUN FEATURES="test" USE="jpeg jpeg2k tiff truetype xvfb X elogind" emerge --verbose --oneshot --getbinpkg=n dev-python/pillow

gentoo/Makefile

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+../Makefile.sub