Optimize Dockerfile and docker compose for Better Performance, Security, and Reduced Image Size

[Neophytis]

Problem

The current Dockerfile has several inefficiencies that impact build time, image size, and security:

• Image Size: PHP image is 2.12GB (disk usage) / 423MB (content size) — can be reduced by ~40–50%.
• Security Issues: Running as root user, unnecessary packages installed, using COMPOSER_ALLOW_SUPERUSER=1.
• Build Inefficiency: 15+ separate RUN commands creating unnecessary layers.
• Missing Optimizations: No multi-stage build separation, inefficient caching.

Current State

IMAGE                    DISK USAGE   CONTENT SIZE
bewelcome/php:latest     2.12GB       423MB
bewelcome/nginx:latest   219MB        76MB

We should also match the MariaDB version until we migrate the platform

mysql  Ver 15.1 Distrib 10.1.48-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

[thisismeonmounteverest]

For mariadb we should use the latest version. A new production deploy would be based on the new docker image anyway.

[Neophytis]

@thisismeonmounteverest the matching version is only during the migration of the data. Once the data is migrated, we can upgrade MariaDB. This will minimize any version incoherence/incompatibility.