Update snapcraft.yaml files

Add arm32 and arm64 binaries if the build is executed on an appropriate host

Signed-off-by: Daniel Llewellyn <daniel@bowlhat.net>

preview/snap/snapcraft.yaml

@@ -61,7 +61,14 @@ parts:
         echo $version > $file
       fi
       echo "getting powershell $version"
-      curl -L -o powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v$version/powershell-$version-linux-x64.tar.gz
+      case "$SNAPCRAFT_ARCH_TRIPLET" in
+        aarch64-linux-gnu)
+          curl -L -o powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v$version/powershell-$version-linux-arm64.tar.gz ;;
+        arm-linux-gnueabihf)
+          curl -L -o powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v$version/powershell-$version-linux-arm32.tar.gz ;;
+        *)
+          curl -L -o powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v$version/powershell-$version-linux-x64.tar.gz ;;
+      esac
       echo "getting Third Party Notice Header"
       curl -L -o thirdPartyNoticeHeader.txt https://raw.githubusercontent.com/PowerShell/PowerShell-Snap/master/assets/thirdPartyNoticeHeader.txt
       mkdir -p $SNAPCRAFT_PART_INSTALL/opt/powershell