(experiment) use GH actions for Windows builds

sum.sh

@@ -1,20 +1,9 @@
 #!/bin/bash
 
-# shasum blows up in Azure, so using this
-# node package which has similar syntax and identical output
-if [[ "$CI_WINDOWS" == "True" ]]; then
-  npm i -g checksum
-fi
-
 sum_file () {
   if [[ -f "$1" ]]; then
-    if [[ "$CI_WINDOWS" == "True" ]]; then
-      checksum -a sha256 "$1" > "$1".sha256
-      checksum -a sha1 "$1" > "$1".sha1
-    else
       shasum -a 256 "$1" > "$1".sha256
       shasum "$1" > "$1".sha1
-    fi
   fi
 }
 
@@ -22,7 +11,7 @@ if [[ "$SHOULD_BUILD" == "yes" ]]; then
   if [[ "$OS_NAME" == "osx" ]]; then
     sum_file VSCodium-darwin-*.zip
     sum_file VSCodium*.dmg
-  elif [[ "$CI_WINDOWS" == "True" ]]; then
+  elif [[ "$OS_NAME" == "windows" ]]; then
     sum_file VSCodiumSetup-*.exe
     sum_file VSCodiumUserSetup-*.exe
     sum_file VSCodium-win32-*.zip