GHA: Provide version.txt with GDExtension builds & demo

.github/workflows/demo.yml

@@ -33,6 +33,7 @@ jobs:
           cp {README,LICENSE}.md demo/
           mkdir -p demo/addons/limboai/
           cp -R icons/ demo/addons/limboai/icons
+          echo "${LIMBOAI_VERSION}" > demo/version.txt
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4

.github/workflows/gdextension.yml

@@ -226,6 +226,7 @@ jobs:
           cp -R limboai/demo/demo/ out/demo/
           cp limboai/demo/LICENSE_ASSETS.md out/demo/
           rm -f out/addons/limboai/bin/*.{exp,lib,pdb}
+          echo "${LIMBOAI_VERSION}" > out/addons/limboai/version.txt
           echo "---"
           ls -R out/