Added a local development DockerFile to the project and applied fixes to some unit tests.

[roje-bodc]

Description

This pull request includes the creation of a development DockerFile that can be used to easily build and deploy a local instance of ERDDAP from source. There has also been changes to some of the Unit Tests in order to allow them to pass within the docker containers environment during the maven packaging process.

Link to discussion: https://github.com/ERDDAP/erddap/discussions/136

Fixes # (issue)

NcHelperTests.java:

• Fixed temporary path issue for tests. They should now be platform agnostic.
• Fixed Exception text assertions. The expected text didn't correctly match what was thrown by the exception.

TableTests.java:

• Slightly upped the time limit for a few tests which were failing on our local machines.
• Fixed typo within resource paths. These are now correct for the resources as they are within the main branch of the project.

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works (Not applicable)
• [x] New and existing unit tests pass locally with my changes