This repository contains various Dockerfiles for different development environments and build configurations.

• fluidsynth-devel - FluidSynth development environment on openSUSE Leap
• qt6-dbg.suse - Qt6 debug environment on openSUSE with debug symbols
• qt6-kf6.ubuntu - Qt6 with KDE Framework on Ubuntu
• qt6.suse - Qt6 development environment on openSUSE
• qt6.ubuntu - Qt6 development environment on Ubuntu
• qt6.win - Qt6 development environment for Windows with vcpkg dependencies

This repository includes a GitHub Actions workflow that automatically builds Docker images when Dockerfiles are modified. The workflow:

• ✅ Only runs when Dockerfile directories or dependencies are changed
• ✅ Detects which specific Dockerfiles have been modified
• ✅ Builds only the changed Docker images (efficient resource usage)
• ✅ Tags images with the commit SHA for version tracking
• ✅ Pushes to a configurable container registry

To configure the Docker registry and credentials, set these repository variables and secrets:

Variables (Repository Settings → Secrets and variables → Actions → Variables):

• DOCKER_REGISTRY - Registry URL (defaults to ghcr.io)
• DOCKER_USERNAME - Registry username (defaults to GitHub actor)

Secrets (Repository Settings → Secrets and variables → Actions → Secrets):

• DOCKER_PASSWORD - Registry password/token (required)

Built images are tagged with:

• Branch name (for branch pushes)
• PR number (for pull requests)
• Commit SHA (always included)

Example tags:

• ghcr.io/owner/fluidsynth-devel:main-abc1234
• ghcr.io/owner/qt6.ubuntu:abc1234567890abcdef1234567890abcdef123456

• The qt6.win image depends on certificates in the certs/ directory
• When certificates are updated, qt6.win will be automatically rebuilt
• Other Dockerfiles are independent and only rebuild when their specific file changes