lagoon-core v2.8.4

This patch release of Lagoon fully reverts the changes introduced in #3133 and #3141

The Lagoon team comprehensively tested these changes prior to release. However, on release, it became apparent that a very small minority of users were using docker-compose.yml files that were incorrectly formatted, and would therefore not be able to be effectively read using our automated tools.

These errors range from full syntax errors (that would prevent docker-compose from working) to minor issues that would cause it to work with some limitations, to other use cases not envisioned in developing our features.

In order to provide the best possible Lagoon experience, this release reverts the new functionality and instead introduces a docker-compose validate step that will raise an issue in the build logs if Lagoon discovers one of these errors. We still intend to release the updated build deploy code in Lagoon v2.9.0 but intend to monitor builds in the meantime to ensure that we've captured a wide range of configurations

tags v2.8.2 and v.2.8.3 have not been converted into releases and can be safely skipped.

Full Changelog: v2.8.1...v2.8.4