message: fix PATH setting in Github Actions
diff: @@ -21,8 +21,7 @@ jobs:
  run: |
  Invoke-WebRequest -Uri https://cran.rstudio.com/bin/windows/Rtools/Rtools35.exe -OutFile ./R35.exe
  Start-Process -FilePath ./R35.exe -ArgumentList /VERYSILENT -NoNewWindow -Wait
  - echo "::add-path::C:/Rtools/bin"
  - echo "::add-path::C:/Rtools/mingw_64/bin"
  + echo "C:/Rtools/bin;C:/Rtools/mingw_64/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
  shell: powershell
  - name: Print toolchain versions and paths
  run: |
  @@ -34,7 +33,7 @@ jobs:
  - name: Build Math libs & add to PATH
  run: |
  mingw32-make -f stan/lib/stan_math/make/standalone math-libs
  - echo "::add-path::D:/a/cmdstan/cmdstan/stan/lib/stan_math/lib/tbb"
  + echo "D:/a/cmdstan/cmdstan/stan/lib/stan_math/lib/tbb" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
  shell: powershell
  - name: Compile & run the example model
  run: |
  