Need to install ourselves so that we can introspect on version
using `setuptools_scm` in `docs/conf.py`.

Signed-off-by: Milas Bowman <[email protected]>

I noticed one Dockerfile was pinned to 1.4; given that there's a
backward compatibility guarantee on the stable syntax, the general
recommendation is to use `dockerfile:1`, which makes sure that the
latest stable release of the Dockerfile syntax is pulled before
building.

While changing, I also made some minor changes to some Dockerfiles
to reduce some unneeded layers.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Add support for floats to docker logs params `since` / `until` since the
Docker Engine APIs support it.

This allows using fractional seconds for greater precision.

Signed-off-by: Archi Moebius <[email protected]>

This is related to moby/moby#44216

Prunes will, by default, no longer prune named volumes, only anonymous ones.

Signed-off-by: Brian Goff <[email protected]>

Fixes #3045

Signed-off-by: Nick Santos <[email protected]>