Provide default password for Dockerfile

[kriszyp]

In our existing harperdb Dockerfile, we provide a default password. Apparently this got removed in /harper-pro and /harper. And I think this means the default docker startup behavior leads to:

harperdb-1  | uncaughtException Error [ERR_USE_AFTER_CLOSE]: readline was closed
harperdb-1  |     at Interface.pause (node:internal/readline/interface:564:13)
harperdb-1  |     at PromptUI.close (/home/harperdb/.npm-global/lib/node_modules/@harperfast/harper-pro/node_modules/inquirer/lib/ui/baseUI.js:56:13)
harperdb-1  |     at PromptUI.onForceClose (/home/harperdb/.npm-global/lib/node_modules/@harperfast/harper-pro/node_modules/inquirer/lib/ui/baseUI.js:34:10)
harperdb-1  |     at process.emit (node:events:520:35) {
harperdb-1  |   code: 'ERR_USE_AFTER_CLOSE'
harperdb-1  | }
harperdb-1  | Please enter a password for the administrative user: [input is hidden] 
harperdb-1 exited with code 0

Which is obviously very confusing and unhelpful. I think it is better to just retain the default password. (it is also possible that I am confused by this too, but I think this is how we address this).