move workaround arm64 ruby install to the build image (#20037)

* Remove arm64 ruby installation workaround

Removed temporary fix for arm64 platform related to ruby installation.

depends on Chia-Network/build-images#105

* drop fpm, update comment

Author: altendky

build_scripts/build_linux_deb-2-installer.sh

@@ -86,12 +86,9 @@ jq --arg VER "$CHIA_INSTALLER_VERSION" '.version=$VER' package.json >temp.json &
 echo "Building Linux(deb) Electron app"
 PRODUCT_NAME="chia"
 if [ "$PLATFORM" = "arm64" ]; then
-  # electron-builder does not work for arm64 as of Aug 16, 2022.
-  # This is a temporary fix.
   # https://github.com/jordansissel/fpm/issues/1801#issuecomment-919877499
-  # @TODO Consolidates the process to amd64 if the issue of electron-builder is resolved
-  sudo apt-get -y install ruby ruby-dev
-  sudo gem install fpm
+  # workaround for above now implemented in the image build at
+  # https://github.com/Chia-Network/build-images/blob/7c74d2f20739543c486c2522032cf09d96396d24/ubuntu-22.04/Dockerfile#L48-L61
   echo USE_SYSTEM_FPM=true "${NPM_PATH}/electron-builder" build --linux deb --arm64 \
     --config.extraMetadata.name=chia-blockchain \
     --config.productName="$PRODUCT_NAME" --config.linux.desktop.Name="Chia Blockchain" \