fix(mysql): improve password compatibility mysql user

[gompa]

improve password compatibility with mysql password requirements
by adding the generate-password node module

[coveralls]

Coverage remained the same at 88.685% when pulling 7754314 on gompa:master into 8ab4892 on TryGhost:master.

[acburdine]

hmm...now that I'm looking at this regex it might actually have issues 😕 I'll test it out though and see if it works/doesn't.

[vikaspotluri123]

@acburdine imho the regex can be simplified to something like ^SET PASSWORD FOR 'ghost-[0-9]{1,4}'@'localhost' = PASSWORD\('.{10,}'\);$ (or can be condensed even more) - the tests are verifying queries and retries rather than a strong password is generated.

[vikaspotluri123]

Also sidenote: I think this is similar to (if not the same idea as) #517

[acburdine]

yeah it's a similar idea - we had a convo on Slack about this approach as well.

However, I figured out that the underlying issue wasn't actually the password itself (although that is a factor). The first issue we have to solve is that the CREATE USER 'ghost-xx'@'localhost' IDENTIFIED WITH mysql_native_password also throws an error, before we even get to the secure password part.

That mysql_native_password thing was added to fix #396 - we need to ensure that whatever solution doesn't make that issue happen again.

[acburdine]

@gompa thanks for the fix! I went ahead and cherry-picked this commit and applied it to #546 -> I had to make some other changes alongside this one.