Switch coi-serviceworker to a git submodule instead of a download.

.github/workflows/godot-ci.yml

@@ -20,6 +20,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           lfs: true
+          submodules: true
       - name: Setup
         run: |
           mkdir -v -p ~/.local/share/godot/export_templates/
@@ -34,10 +35,8 @@ jobs:
       # https://github.com/godotengine/godot-proposals/issues/6616#issuecomment-1513340085
       - name: Inject coi-serviceworker
         run: |
-          cd $PROJECT_PATH/../build/web/
-          apt-get update && apt-get install -y curl
-          curl -fsSL https://github.com/gzuidhof/coi-serviceworker/raw/master/coi-serviceworker.js > coi-serviceworker.js
-          sed -i 's#\(		<script src="index.js"></script>\)#		<script src="coi-serviceworker.js"></script>\n\1#g' index.html
+          cp external/coi-serviceworker/coi-serviceworker.js build/web/coi-serviceworker.js
+          sed -i 's#\(		<script src="index.js"></script>\)#		<script src="coi-serviceworker.js"></script>\n\1#g' build/web/index.html
       - name: Upload Artifact
         uses: actions/upload-artifact@v1
         with:

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "external/coi-serviceworker"]
+	path = external/coi-serviceworker
+	url = https://github.com/gzuidhof/coi-serviceworker.git