[docker] Single quote in SESSION_NAME config will break JS templating

[Yomguithereal]

We need to fix, maybe, this part.

[robindemourat]

Memo : this is related to the use of envsubt. We have to either:

• check if it is possible to escape characters with envsubt
• write a custom node script to do the job

[robindemourat]

Problem with underscore in session name too.