This is necessary because Chromium needs to think that the Host header
is an IP address (for security reasons), but the browser needs to think
that the Host header is a domain name (for TLS purposes). The easiest
way to do this is to use the Nginx http_sub module, but this isn't
enabled in the default SlapOS Nginx build.

The nginx proxy configuration now works with websockets. It's now possible to use the remote debugging port from another machine! Note that you'll need to manually change the ws=[ip:port] parameter in the URL to wss=[server-cdn-url] still. I will see if I can patch the frontend page to not require this, but I wanted to commit a working version first.

Cloning the full source tree rather than just a snapshot at the desired
version does increase the size of the checkout, but not as much as
originally feared. It goes from 25 GB -> 31 GB, which is manageable.
On the other hand, this allows some automated tools to figure out the
commit hashes from the repository history, which prevents the frontend
from complaining.

I plan to clean up the buildout file in the future, but I just wanted
to commit a known-working version.

Cloning the full source tree rather than just a snapshot at the desired
version does increase the size of the checkout, but not as much as
originally feared. It goes from 25 GB -> 31 GB, which is manageable.
On the other hand, this allows some automated tools to figure out the
commit hashes from the repository history, which prevents the frontend
from complaining.

I plan to clean up the buildout file in the future, but I just wanted
to commit a known-working version.

Also improve the recipe `switch-softwaretype' by catching the possible errors.

- directory html5as: final version 
- directory html5as-base: initial version

See merge request nexedi/slapos!1006

See merge request nexedi/slapos!1003

See nexedi/slapos!1008

This is based on commit "Firefox Version Up to 78.1.0esr", but it does not
replace the default firefox, just enable a new version for now.

This is a "minimal" version up to fix https://bugs.gentoo.org/580392 which
appears now that we build with gbm

some components, like binary chromium needs libgbm, which is part of mesa, but
build only when enabled.

fixup for 452e8f78

See nexedi/slapos!1008

* [slapos-master](https://nexedijs.erp5.net/#/test_result_module/20210629-DE509CB3/23) is failing in checkSoftware step, because:
  * wcfs is linked against system zlib (fixed in this MR)
  * the .so in the build directory have missing references. I think we don't need to check in build folders and also liblibgolang is missing, but it's not a problem because of the way we load dynamically at runtime, so I suggest changing checkSoftware in nexedi/slapos.core!317
* [gitlab](https://nexedijs.erp5.net/#/test_result_module/20210629-DE509CB3/10) is failing for some time because mimemagic have been yanked from rubygems. This is a minimal change to get the test running again, to prevent other problems to sneak in while we don't have tests

See merge request nexedi/slapos!1007

see gitlab-ce!5