Update ci.yml

Author: ChrisDenton

.github/workflows/ci.yml

@@ -89,7 +89,8 @@ jobs:
           &$vs\Common7\Tools\Launch-VsDevShell.ps1 -HostArch Amd64 -Arch x86
           Enter-VsDevshell -VsInstallPath $vs -HostArch Amd64 -Arch x86 -DevCmdArguments "-winsdk=10.0.22621.0"
           ls env: | foreach { echo "$($_.key)=$($_.value)" } >> $env:GITHUB_ENV
-          "$env:PATH;c:/msys64/usr/bin" >> $env:GITHUB_PATH
+          $env:PATH += ";c:/msys64/usr/bin"
+          $env:PATH >> $env:GITHUB_PATH
 
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false