Have DB creation script account for username

[drewmarshburn]

This script previously made incorrect assumptions about the name of the database user and the name of the database. Providing connection strings with no db name initiates a connection using the username as the database name. Instead, the connection should always be made to the default postgres database.

[onelapahead]

lgtm otherwise! Thanks for finding this edge case and submitting a fix.

[onelapahead]

Does this still work if the DB doesn't require auth? Know thats a bit unlikely / harder to test.

[drewmarshburn]

Yeah that's a good point. Now, we need connection strings in at least this format:

"postgresql://[username]:[password]/[database]"

Looking at their doc (https://www.postgresql.org/docs/current/libpq-connect.html), supporting all formats of connection strings would be pretty difficult. Wondering what we need to support here? @peterbroadhurst and @hfuss any insights from what you've previously deployed? It may also be easier to provide the PSQL connection info as separate chart values instead of winding up with all this sed echo fun | sed 's/fun/suffering/'.

[onelapahead]

I think assuming the PSQL string will have basic auth creds is fine for now. Most users are going to have a setup like that when using the chart.

[onelapahead]

@drewmarshburn please rebase your PR off the latest upstream/main to get the changes from #359 and to retrigger the Go build that broke yesterday.

This should be good to merge after that.