launch i3 via startx (kbd & mouse non-functional)

Dockerfile

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+# std = slim ∪ {iproute2, ping}
+FROM debian:10.7
+
+# TODO delete apt lists
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --yes \
+        i3-wm \
+        tini \
+        xinit \
+        xserver-xorg-core
+# TODO change user
+ENTRYPOINT ["/usr/bin/tini", "--"]
+CMD ["startx", "/usr/bin/i3"]

README.md

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+TODO drop caps
+
+```sh
+sudo docker build -t xorg-test .
+sudo docker run --rm -it \
+    --device /dev/tty0 --device /dev/dri --device /dev/tty2 \
+    --userns host --group-add tty --group-add video --group-add input \
+    --cap-add SYS_ADMIN xorg-test
+```