Fix AppImage's dependency (#775)

* move dependency installation into workflow

* dependency install not needed

create_appimage.sh

@@ -3,9 +3,6 @@
 cd ..
 
 if [[ "$VSCODE_ARCH" == "x64" ]]; then
-  # install a dep needed for this process
-  sudo apt-get install desktop-file-utils
-
   wget -c https://github.com/$(wget -q https://github.com/AppImage/pkg2appimage/releases -O - | grep "pkg2appimage-.*-x86_64.AppImage" | head -n 1 | cut -d '"' -f 2)
   chmod +x ./pkg2appimage-*.AppImage
 

docs/build.md

@@ -53,7 +53,7 @@ docker run -ti --volume=<local vscodium source>:/root/vscodium --name=vscodium-b
 When inside the container, you can use the following commands to build:
 ```
 curl -fsSL https://deb.nodesource.com/setup_14.x | sudo -E bash -
-sudo apt-get install -y nodejs
+sudo apt-get install -y nodejs desktop-file-utils
 
 npm install -g yarn