Falco 0.40.0 changes

[FedeDP]

/area documentation

What would you like to be added:

• new docker images: new(docker): streamline docker images falco#3273
  • 👉 update docker images usage for Falco 0.40 #1411 (thanks @leogr)
• New append_output.suggested_output config key: new(userspace): honor new plugins exposed suggested output formats falco#3388
  • 👉 docs(content): improve Alert Formatting and add suggested_output #1435
• jemalloc allocator: new(cmake,ci): added support for using jemalloc allocator instead of glibc one falco#3406 (don't know if worth mentioning)
• New plugins_hostinfo configuration key: new(userspace/falco): allow entirely disabling plugin hostinfo support. falco#3412
• len transformer: [part 1/n] Introduce vtable-based dispatch libs#213
  • 👉 update(content): rework "condition syntax" section and add len() #1434

Why is this needed:

[FedeDP]

cc @falcosecurity/falco-maintainers add here other changes.

[leogr]

We also need to document the re-introduction of the static build: falcosecurity/falco#3428

[leogr]

#1434

[leogr]

Just added #1435 cc @leogr @FedeDP

[leogr]

• jemalloc allocator: new(cmake,ci): added support for using jemalloc allocator instead of glibc one falco#3406 (don't know if worth mentioning)

I guess this is more of a release blog post thing (cc @alacuku

[leogr]

• New plugins_hostinfo configuration key: new(userspace/falco): allow entirely disabling plugin hostinfo support. falco#3412

I'm considering postponing this for a while for several reasons:

• it's a sandbox feature, likely subject to changes in the foreseeable future
• we do not yet have a central place for the Falco configuration in the docs, so it's 100% clear where we should put it eventually
• the most valuable candidate is https://falco.org/docs/concepts/plugins/usage/; however, it must be revised first since some information is quite old

So I would move plugins_hostinfo into a broader initiative to rework all the plugin documentation (that I aim to work on as a part of #1365. Let me know if you disagree.