[local app] Do not always start dropbear

[aledbf]

Right now, dropbear is started in every workspace (even if we don't use it)
Reasons:

• Generation of the SSH key consumes too much CPU

[csweichel]

instead we should start it explicitly using supervisor API. Especially the dropbearkey operation is expensive in terms of CPU and should only be done when needed.

[akosyakov]

@csweichel Can we listen to ssh tcp port and activate the server if one tries to connect, i.e. have some kind of proy?

[csweichel]

Inetd style socket activation could also do the trick

[csweichel]

/schedule

[roboquat]

@csweichel: Issue scheduled in the IDE team (WIP: 0)

In response to this:

/schedule

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[csweichel]

/assign @aledbf