Create build & install commands for godot

.gitlab-ci.yml

+build:
+  image: docker:latest
+  stage: build
+  services:
+    - docker:dind
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  script:
+    - |
+      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
+        tag=""
+        echo "Running on default branch '$CI_DEFAULT_BRANCH': tag = 'latest'"
+      else
+        tag=":$CI_COMMIT_REF_SLUG"
+        echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
+      fi
+    - docker build --pull -f Dockerfile -t "$CI_REGISTRY_IMAGE${tag}" .
+    - docker push "$CI_REGISTRY_IMAGE${tag}"
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Dockerfile

+FROM debian:12.8-slim
+
+ARG PLATFORM="linux.x86_64"
+ARG GODOT_VERSION="4.3-stable"
+
+RUN apt-get update \
+    && apt-get install -y wget unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY ./godot_build.sh /usr/bin/godot_build
+COPY ./godot_install.sh /usr/bin/godot_install
+
+RUN godot_install $GODOT_VERSION $PLATFORM && cp ./godot /usr/bin/godot
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README.md

+## Godot Builder
+
+A base debian image, configured with tools and helpers required to build godot games in CI
+
+### Commands
+
+#### godot
+
+The docker image contains the full godot editor binary, 
+available anywhere in the system referenced as `godot`.
+If you extend this image to have graphical capabilities,
+this can be used to launch full editor instances. Otherwise
+the `--headless` option is recommended
+
+#### godot_build
+
+Build a godot project. Paths for this command are based on 
+the _container_, not the host system, so be aware of your
+volume mounts
+
+Usage `godot_build [Output Name] [Preset Name] [Project Path]`
+
+This command expects the given preset name to have already
+been configured in your project's Export panel 
+(`Project` -> `Export` in the editor menu), and that it can
+locate a valid Godot project within the path. The Output name
+will be used for the generated executable.
+
+_The project path must point to a folder that **contains** a
+`project.godot` file, it must not point to the file itself_
+
+**Example**: 
+
+Exporting a Linux build of a game mounted to the path "/var/godot_project" 
+
+`godot_build excellent_runner Linux /var/godot_project`
+
+#### godot_install
+
+Typically not required in user scripts, but can be used to 
+install a different version or architecture of godot
+
+Usage: `godot_install [Godot Version] [Platform Slug]`
+
+**Example**: 
+
+Install the 4.3 RC 1 build for macOS 
+
+`godot_install 4.3-rc1 macos.universal`
+ 
+This command is most useful for the following platform slugs:
+- `linux.x86_64`
+- `macos.universal`
+- `win64.exe`
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godot_build.sh

+#!/usr/bin/env bash
+
+NAME="$1"
+PRESET="$2"
+PROJECT_PATH="$3"
+
+godot --headless --export-debug "${PRESET}" "$(pwd)/${NAME}" "${PROJECT_PATH}/project.godot"
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godot_install.sh

+#!/usr/bin/env bash
+
+VERSION="$1"
+PLATFORM="$2"
+
+TMP_PATH="/tmp/godot"
+mkdir -p "$TMP_PATH"
+
+BINARY_NAME="Godot_v${VERSION}_${PLATFORM}"
+TMP_PATH="$TMP_PATH/godot_${VERSION}_${PLATFORM}.zip"
+ARTIFACT_PATH="https://github.com/godotengine/godot-builds/releases/download/${VERSION}/${BINARY_NAME}.zip"
+
+wget -O "$TMP_PATH" "$ARTIFACT_PATH"
+unzip -o "$TMP_PATH" -d "$(pwd)"
+mv "$BINARY_NAME" godot
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