Add pkgcheck recipe.

pkgcheck.Dockerfile

@@ -0,0 +1,41 @@
+# Portage tree.
+FROM gentoo/portage:latest as portage
+
+# Minimal Gentoo image without build dependencies.
+FROM tastytea/gentoo-base:latest as gentoo-base
+
+# Build packages in /workdir.
+FROM gentoo/stage3-amd64:latest as build
+COPY --from=portage /var/db/repos/gentoo /var/db/repos/gentoo
+COPY --from=gentoo-base / /workdir
+RUN cp /workdir/etc/portage/make.conf /etc/portage/make.conf
+ENV USE "-curl -webdav"
+RUN eselect profile set default/linux/amd64/17.1
+RUN mkdir -p /etc/portage/package.accept_keywords
+RUN echo -e 'dev-util/pkgcheck\n  sys-apps/pkgcore' >> \
+    /etc/portage/package.accept_keywords/portage
+RUN quickpkg --include-config=y @world sys-libs/glibc
+RUN emerge --root=/workdir --buildpkg=y --usepkg --quiet \
+    dev-util/pkgcheck sys-devel/gcc
+RUN emerge --root=/workdir --rage-clean --quiet \
+    app-arch/tar \
+    app-arch/xz-utils \
+    dev-libs/openssl \
+    net-dns/libidn2 \
+    net-misc/rsync \
+    sys-apps/file \
+    sys-apps/sed \
+    dev-lang/perl \
+    sys-libs/timezone-data \
+    app-misc/ca-certificates
+RUN rm -r /workdir/usr/share/gtk-doc
+RUN rm -r /workdir/usr/include
+RUN rm -r /workdir/var/db/pkg
+
+# Final image.
+FROM gentoo/portage:latest
+LABEL maintainer="tastytea+docker@tastytea.de"
+LABEL description="Latest ~amd64 dev-util/pkgcheck."
+COPY --from=build /workdir /
+RUN eselect profile set default/linux/amd64/17.1
+ENV LANG "en_DK.utf8"