Fix file_upload url decoding

See merge request memri/pod!241

Add support for PluginAuth for file upload

See merge request memri/pod!240

Improve HTTP body parsing error reporting

See merge request memri/pod!239

Fix hosted kubectl to only run plugins once

See merge request memri/pod!236

Fix kubernetes image names

See merge request memri/pod!235

Include full docker in docker image

See merge request memri/pod!234

Pin and periodically update docker base image

See merge request memri/pod!233

See memri/pod#401
for longer-term solution

unsafe mode

See merge request memri/pod!208

Fix cargo audit

See merge request memri/pod!231

zeroize has to be kept at 1.3.0 for now to keep compatibility with
another dependency of the Pod, chacha20poly1305.