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 !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.

# Conflicts:
#	src/plugin_run.rs

In the future, Schema interaction will be
re-factored to a different approach.
It will be scoped per-plugin. For now creating duplicates
of the Schema items feels like a better approach..

WIP fix CI

WIP fix CI

WIP add CI caching

WIP fix CI

Use smarter caching

Fix CI

Check CI caching

Require a "docker" CI runner

WIP trigger CI

Scope CI tags under default config