Added more informative output when unable to connect.

[ISlavinskyi]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Unable to connect to the database. Retrying (1)...

What is the new behavior?

Unable to connect to the database. Message: password authentication failed for user "postgres". Retrying (1)...

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[kamilmysliwiec]

This message is hidden on purpose to avoid duplicating it between several "retry" messages. It will show up eventually (after the last retry) anyway.

If you think that having it for every error log might be valuable, can we add it under a configuration option? For example, when someone explicitly specifies: verboseRetryLog: true?

[ISlavinskyi]

This message is hidden on purpose to avoid duplicating it between several "retry" messages. It will show up eventually (after the last retry) anyway.

If you think that having it for every error log might be valuable, can we add it under a configuration option? For example, when someone explicitly specifies: verboseRetryLog: true?

Yeah, it will be cool feature, which helps in dev mode, where developer can see error message and error code

[kamilmysliwiec]

Can you add it to your PR then @ISlavinskyi :) ? verboseRetryLog config option to enable verbose messages on each retry.

Also, please, resolve conflicts that popped up after merging another PR.

[ISlavinskyi]

Can you add it to your PR then @ISlavinskyi :) ? verboseRetryLog config option to enable verbose messages on each retry.

Also, please, resolve conflicts that popped up after merging another PR.

done :)

[kamilmysliwiec]

Looks great, thank you!