nginx port is a parameter

This was using master branch and when it got renamed to main this
stopped working and we realized that the revision was not pinned.

KVM which defaults to 1024 RAM, 10 GB disk and 1 CPU is too small for nowadays
OS requirements, so to avoid confusions, increase the defaults.

Because of a bug in checkSoftware ( slapos.core!339 ) we did not check some .so for missing rpath.

Add the missing rpaths now that these are correctly detected by checkSoftware

See merge request !1064

Sometimes on testnodes hugo refuses to start because:

    Error: add site dependencies: create deps: failed to create file caches from configuration: mkdir /tmp/hugo_cache/default: permission denied
    Total in 0 ms

new cmmi recipe prevent from having twice the same environment variable.
Also correctly setup swig libraries and fix gobject-introspection compilation.

https://github.com/eclipse-theia/theia/blob/v1.18.0/CHANGELOG.md#v1180---9302021

See merge request !1061

Adapt all promise sections to changes in plugin promise recipe.

As Debian Bullseye has been released, set it as first option.

As Debian Buster 10.11 update has been released, upgrade it.

The real predicate to find the master partition is rejected slave publisher
configuration.

After upgrade to OpensSSH 8.8p1 the simple ssh-rsa keys are not accepted
anymore.

Also move component/stunnel to unstable