Speed up testcontainers intialization time

[sviatoslav1989]

Hi everyone! I built a small Java library that sits on top of Testcontainers and speeds up integration tests when container startup is the bottleneck.

preinit-testcontainers runs your init (SQL scripts, migrations, custom callbacks) once, commits a local Docker image, and reuses it on every start(). Combined with tmpfs snapshot/restore, repeat starts are much faster - e.g. MySQL with 100 tables went from ~13.6s to ~1.4s on my machine.

Modules: MySQL, PostgreSQL, ClickHouse, Redis, plus a generic core for other images. Testcontainers 1.x, 2.x, Java 8+, on Maven Central.

GitHub: https://github.com/sviatoslav1989/preinit-testcontainers
Article (tmpfs + pre-init, with benchmarks): https://sviat-tech.com/integration-tests-java-testcontainers-tmpfs-preinit/
Would love feedback if you try it