This is a partial fix for #496
* BREAKING: Now Martin behaves the same way as `psql` -- by default, if
SSL is available on the server, it will be used, even though it will not
verify that the server has a valid SSL certificate
* Martin now understands `PGSSLCERT`, `PGSSLKEY`, and `PGSSLROOTCERT`
env vars (and corresponding config keys) - same as psql.
* Martin can now process `?sslmode=verify-ca` and `verify-full` (just
like psql). The verify modes require root and/or client cert & key.
* remove `danger_accept_invalid_certs` -- turns out that behavior is
expected by default unless ssl mode is set to verify - which upstream
lib [does not
support](https://github.com/sfackler/rust-postgres/issues/768) - PR
[submitted](https://github.com/sfackler/rust-postgres/pull/988).
* added connection_timeout_ms option for postgres and set it to 5
seconds by default. This way it will fail out earlier.
* added error reporting to bb8 - but it is currently [broken
upstream](https://github.com/djc/bb8/issues/151) - not sure we can fix
it easily, so may need to switch to deadpool later.
* added docker-based TLS test (horray!) - wasn't trivial at all, despite
ending up fairly simple.
* fixed SQL to work on older PG versions
* re-enable CI to test expected `test.sh` output against the one stored
in the `tests/expected`
* add postgres in docker tests on linux - one for the oldest supported
DB, and another using the more recent version
* minor justfile cleanup
* ensure config files are sorted alphabetically
* bump docker compose to use latest supported db and postgis
* update justfile to allow simple legacy testing
* update readme
Followup: implement CI testing -- see #502
This PR re-uses some ideas by @gbip from #448
* move all CI github workflow tests into the dedicated shell scripts
* consolitade two database initialization scripts into one
Note that I manually published [maplibre/martin:latest](https://hub.docker.com/r/maplibre/martin) to docker, so it might be able to pass CI ok. I have not looked deeply into the existing CI workflow - @stepankuzmin any suggestions on changes to that? The github actions are now setup
P.S. I am not certain what that whole `brew/tap` thing is - don't know enough about Macs
