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README.md

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+# 🏗️ Godot Builder Image
+This repository contains the `Dockerfile` definition for a custom build container used by our Gitea Runners.
+
+It is designed to cross-compile Godot Engine and GDExtension projects for **Linux (x86_64)** and **Windows (x86_64/MinGW)**.
+
+## 📦 What's Inside?
+The image is based on Fedora 39 (to ensure up-to-date MinGW packages) and includes:
+
+- Build Systems: `SCons`, `Make`, `Automake`, `Git`
+
+- Compilers: `GCC (Linux)`, `MinGW-w64` (Windows Cross-compile), `Yasm`
+
+- Godot Dependencies: `X11`, `Mesa (GL)`, `ALSA`, `PulseAudio`, `uDev`
+
+## 🚀 How to Build & Publish
+This process is automated.
+
+1. **Modify**: Make changes to the Dockerfile if you need new dependencies (e.g., Python, newer GCC).
+
+- **Push**: Commit and push your changes to the `main` branch.
+
+```
+Bash
+
+git add Dockerfile
+git commit -m "Update builder dependencies"
+git push origin main
+```
+3. **Watch**: Go to the **Actions** tab in Gitea to see the build progress.
+
+4. **Verify**: Once green, go to your **Profile > Packages** tab. You should see a new version of `godot-builder` tagged `latest`.
+
+## 🛠 Manual Usage (Local Testing)
+If you need to test this image locally before pushing:
+
+```
+Bash
+
+# Build locally
+docker build -t godot-builder:local .
+
+# Test compiling a project locally
+
+docker run --rm -v $(pwd):/workspace -w /workspace godot-builder:local \
+    scons platform=linux target=template_debug
+```
+
+## 📄 Dockerfile Reference
+```Dockerfile
+
+FROM fedora:39
+
+# Install Build Tools & Cross-Compilers
+RUN dnf -y install \
+    git scons make automake which yasm \
+    gcc gcc-c++ kernel-headers \
+    mingw64-gcc mingw64-gcc-c++ mingw64-winpthreads-static \
+    libX11-devel libXcursor-devel libXrandr-devel libXinerama-devel libXi-devel \
+    mesa-libGL-devel alsa-lib-devel pulseaudio-libs-devel libudev-devel \
+    && dnf clean all
+
+CMD ["/bin/bash"]
+```