* MM-23250: improve config.Migrate tests
The config.Migrate tests were not running in isolation, but wrote over the "local" config. The test coverage for both directions was not exhaustive, and lacked coverage for the recently added plugin signature files.
Rewrite the unit tests as such, fixing a minor issue closing the stores after migration.
Fixes: https://mattermost.atlassian.net/browse/MM-23250
* idiomatic err checking
* clarify random file contents
Co-authored-by: mattermod <mattermod@users.noreply.github.com>
* Run all tests fasts in postgres
* Moving postgres config to a file
* Addressing PR review comments
* Testing against mysql in the CI to keep things less changed
* Revert "Testing against mysql in the CI to keep things less changed"
This reverts commit fc940c111db269a821c54e005d76df87cb70e031.
* Fixing a test broken in postgres but working in mysql
* Fixing some tests
* Fixing some config tests with postgres
* Fixing the rest of config tests
* Fixing govet error
* Fixing search tests for postgres
* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
