[TOOL IMPROVEMENT] Bcrypt cost (rounds) limit

[realgeek]

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Describe the solution you'd like I would love it if we could set an environment variable for the Docker image to increase the maximum cost of the bcrypt tool to something greater than 10. I was working on an application recently that used a cost factor of 12 and was disappointed that I couldn't use IT-Tools to generate a new password hash for it.

Additional context I used htpasswd to accomplish what I was after, and there was no noticeable wait for the output.

[sharevb]

HI @realgeek and @CorentinTh, fixed in #987