publish Docker images to GHCR, and optimize web Dockerfile

[Mateusz-Krajewski]

Summary

Improve deployments using pre-built container images and speed up / slim down the PHP Apache image build.

Changes

• GitHub Actions (docker-publish): Build and push cloudlog-web and cloudlog-db to GitHub Container Registry (ghcr.io). Tags follow semver (MAJOR.MINOR.PATCH), plus workflow_dispatch. Multi-arch linux/amd64 and linux/arm64 only (no linux/arm/v7 for the DB image—the official MariaDB image does not ship that variant).
• Compose: Split docker-compose.yml (development: local build + bind mount) and docker-compose.prod.yml (registry images only). Document optional CLOUDLOG_IMAGE_* overrides in .env.sample where applicable.
• Cypress CI: Start the stack from docker-compose.prod.yml (pull then up).
• Web Dockerfile: Single layer for APT cleanup + PHP extensions (docker-php-ext-install -j$(nproc)), --no-install-recommends, enable curl PHP extension (used by the app), write uploads.ini with printf, fewer layers overall.
• .dockerignore: Much smaller build context by excluding large dirs (e.g. application/, assets/, node_modules, cypress/) while keeping script.sh and install/ for the DB image.

Notes for reviewers

• The first successful workflow run must publish images before docker compose pull works in prod/CI without a local build.
• GHCR package visibility may need to be set to public if you want anonymous image pulls.

[Copilot]

Pull request overview

This PR aims to improve Docker-based deployments by publishing pre-built cloudlog-web / cloudlog-db images to GHCR and streamlining the PHP Apache image build, while adjusting CI and compose files to consume registry images.

Changes:

• Adds a GitHub Actions workflow to build and push multi-arch Docker images to GHCR.
• Updates the Cypress CI workflow and dev compose configuration to start services via compose with registry images.
• Optimizes the web Dockerfile and adds a .dockerignore to reduce build context size.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
Dockerfile	Consolidates APT + PHP extension install steps and writes uploads.ini more cleanly.
docker-compose.yml	Sets image: for web/db services (while keeping build: for dev).
.github/workflows/docker-publish.yml	Introduces GHCR publish workflow using Buildx/QEMU and metadata-action tags.
.github/workflows/cypress-tests.yml	Switches CI stack startup to docker-compose.prod.yml with a pull step.
.env.sample	Documents optional GHCR image override variables (commented).
.dockerignore	Excludes large directories to reduce Docker build context.