Deploying Finovara on Docker and fixing a critical bug.

I recently decided to move my Spring Boot app Finovara to Docker. At first it was just supposed to be a small improvement to the setup. In reality, it turned into a debugging session that took way longer than I expected. Why I even bothered with Docker There were a few reasons behind this: I wanted more control over the environment I needed a separate database ( finovara-test ) for automated tests I was tired of manually setting everything up locally and I wanted something closer to a real production setup Initial setup I started with a simple PostgreSQL container and connected my app to it. Here’s a simplified version of what I used: services : finovara-db : image : postgres:15 container_name : finovara-db restart : always environment : POSTGRES_DB : finovara POSTGRES_USER : postgres POSTGRES_PASSWORD : ${DB_PASSWORD} ports : - " 5432:5432" healthcheck : test : [ " CMD-SHELL" , " pg_isready -U postgres" ] interval : 5s retries : 10 Dockerfile: FROM eclipse-temurin:21-jdk WORKDIR /app