Feature/348 container images

[MikeNeilson]

Provide docker compose for Postgres implementation to help get people started.
Will also create one for CWMS and the OpenDCS Oracle impl later.

... will also change the branch name later so it makes sense... it's late.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[krowvin]

Worked for me!

Would also appreciate a .gitattributes with
*.sh text eol=lf

It will save me on Windows with the IDE defaulting to CLRF without it!

Also consider going ahead and adding a table of handy URL to the README (including the pgadmin page)

[krowvin]

Can I cry lazy on this one (opinion)

Don't make folks specify a docker compose file with:
docker compose -f docker-compose.pg.yaml up

My opinion would be to create a standard docker file for testing and then an opt in one for additional tests. I imagine you eventually want one for oracle too.

[MikeNeilson]

Perhaps I'll make a sym link. The idea is to have a compose for each implementation. They're different enough it doesn't make sense to try and have a shared file.

Bit of the curse of so much flexibility.

[MikeNeilson]

Closing as reusing the branch name was wrong and unintentional. See #554