Github action used to automatically export your godot project for github pages

godot4-web-deployer.yml

# Make sure you have an export preset for web and you must
# have put `<script src="coi-serviceworker.js"></script>`
# in the "Head Include" property of the preset the
# "coi-serviceworker.js" script allow setting COOP and COEP
# headers in Github Pages, without, the game will not load

name: "godot4-web-deployer"
on: push

permissions:
  contents: write

env:
  GODOT_MAJOR_MINOR_VERSION: "4.0" # must be a string, not a number
  GODOT_PATCH_VERSION: beta12

  PROJECT_FOLDER: "." # the path to the godot project (must contain `project.godot` file) relative to the github root path

  EXPORT_TEMPLATE: release # export with release || debug
  EXPORT_PRESET_NAME: Web # name of the preset
  EXPORT_FOLDER: build/ # just the folder where the project will be build, not really important
  EXPORT_FILENAME: index.html # export file name

  DEPLOYMENT_BRANCH: gh-pages # the name of the branch, will be automatically created if it does not exist

jobs:
  export_web:
    runs-on: ubuntu-latest
    name: Export Web Game
    steps:
    - name: "Set environmental variables"
      # If you have a custom godot you may want to modify the urls to download your own godot and templates
      run: |
        echo "GODOT_VERSION=${GODOT_MAJOR_MINOR_VERSION}.${GODOT_PATCH_VERSION}" >> $GITHUB_ENV

        echo "GODOT_EXECUTABLE_DOWNLOAD_URL=https://downloads.tuxfamily.org/godotengine/${GODOT_MAJOR_MINOR_VERSION}/${GODOT_PATCH_VERSION}/Godot_v${GODOT_MAJOR_MINOR_VERSION}-${GODOT_PATCH_VERSION}_linux.x86_64.zip" >> $GITHUB_ENV
        echo "GODOT_TEMPLATES_DOWNLOAD_URL=https://downloads.tuxfamily.org/godotengine/${GODOT_MAJOR_MINOR_VERSION}/${GODOT_PATCH_VERSION}/Godot_v${GODOT_MAJOR_MINOR_VERSION}-${GODOT_PATCH_VERSION}_export_templates.tpz" >> $GITHUB_ENV

    - name: Checkout
      uses: actions/checkout@v3
    
    - name: Install Godot
      run: |
        # Download godot executable and templates
        curl ${GODOT_EXECUTABLE_DOWNLOAD_URL} --output godot.zip
        curl ${GODOT_TEMPLATES_DOWNLOAD_URL} --output templates.tpz

        unzip godot.zip -d godot
        unzip templates.tpz

        # Create needed dirs
        # Templates with godot 4 must be in ~/.local/share/godot/export_templates/${MAJOR.MINOR.PATCH}
        mkdir -v -p ~/.local/share/godot/export_templates/${GODOT_VERSION}
        
        mv templates/* ~/.local/share/godot/export_templates/${GODOT_VERSION}
        mv godot/Godot* ${GITHUB_WORKSPACE}/godot.x86_64

        # Just cleaning
        rm -R templates/
        rm templates.tpz
    
    - name: Build Project
      run: |
        mkdir -v -p ${GITHUB_WORKSPACE}/${EXPORT_FOLDER}
        cd ${PROJECT_FOLDER}

        # Exporting the game
        ${GITHUB_WORKSPACE}/godot.x86_64 --headless --path . --export-${EXPORT_TEMPLATE} ${EXPORT_PRESET_NAME} ${GITHUB_WORKSPACE}/${EXPORT_FOLDER}/${EXPORT_FILENAME}
    
    - name: Add coi-service-worker
      run: |
        git clone https://github.com/gzuidhof/coi-serviceworker.git
        mv coi-serviceworker/coi-serviceworker.js ${EXPORT_FOLDER}/coi-serviceworker.js
    
    - name: Upload Artifact
      uses: actions/upload-artifact@v3
      with:
        name: ${{ env.EXPORT_PRESET_NAME }}
        path: ${{ env.EXPORT_FOLDER }}
    
    - name: Deploy to GitHub Pages 🚀
      uses: JamesIves/github-pages-deploy-action@v4
      with:
        branch: ${{ env.DEPLOYMENT_BRANCH }}
        folder: ${{ env.EXPORT_FOLDER }}