Add PATH setting to RTools block

Author: andrjohns

.github/workflows/main.yml

@@ -49,6 +49,7 @@ jobs:
         Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/$RTOOLS.exe -OutFile "$RTOOLS.exe"
         Start-Process -FilePath "$RTOOLS.exe" -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
         echo "C:/$RTOOLS/usr/bin;C:/$RTOOLS/$ARCH-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
+        echo "$(pwd)/lib/tbb" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
 
     - name: Build Math libs
       shell: pwsh
@@ -57,11 +58,6 @@ jobs:
         Add-Content make\local "STAN_THREADS=true`n"
         make -f make/standalone math-libs -j2
 
-    - name: Add TBB to PATH
-      if: runner.os == 'Windows'
-      shell: pwsh
-      run: echo "$(pwd)/lib/tbb" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
-
     - name: Run ${{ matrix.config.label }} unit tests
       shell: pwsh
       run: |
@@ -97,6 +93,7 @@ jobs:
         Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/$RTOOLS.exe -OutFile "$RTOOLS.exe"
         Start-Process -FilePath "$RTOOLS.exe" -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
         echo "C:/$RTOOLS/usr/bin;C:/$RTOOLS/$ARCH-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
+        echo "$(pwd)/lib/tbb" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
 
     - name: Build Math libs
       shell: pwsh
@@ -105,11 +102,6 @@ jobs:
         Add-Content make\local "STAN_THREADS=true`n"
         make -f make/standalone math-libs -j2
 
-    - name: Add TBB to PATH
-      if: runner.os == 'Windows'
-      shell: pwsh
-      run: echo "C:/a/math/math/lib/tbb" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
-
     - name: Run mix/fun unit tests
       shell: pwsh
       run: |