Switch Action and docs to use PowerShell

.github/workflows/nuget.yml

@@ -25,23 +25,30 @@ jobs:
         submodules: recursive
 
     - name: Install Dependencies
+      shell: powershell
       run: |
           nuget install CMake-win64 -Version 3.15.5 -OutputDirectory C:\Tools\CMake
           nuget install Bison -Version 3.7.4 -OutputDirectory C:\Tools\bison
           nuget install PCRE2 -Version 10.39 -OutputDirectory C:\Tools\pcre2
 
     - name: Build
-      shell: cmd
+      shell: powershell
       run: |
-          SET PATH=C:\Tools\CMake\CMake-win64.3.15.5\bin;C:\Tools\bison\Bison.3.7.4\bin;%PATH%
-          SET PCRE_ROOT=C:\Tools\pcre2\PCRE2.10.39.0
-          SET PCRE_PLATFORM=x64
-          cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX="%CD:\=/%/install2" -DCMAKE_C_FLAGS="/DPCRE2_STATIC" ^
-          -DCMAKE_CXX_FLAGS="/DPCRE2_STATIC" -DPCRE2_INCLUDE_DIR=%PCRE_ROOT%/include -DPCRE2_LIBRARY=%PCRE_ROOT%/lib/pcre2-8-static.lib -S . -B build
+          $env:PATH="C:\Tools\CMake\CMake-win64.3.15.5\bin;C:\Tools\bison\Bison.3.7.4\bin;" + $env:PATH
+          $PCRE_ROOT="C:\Tools\pcre2\PCRE2.10.39.0"
+          $PCRE_PLATFORM="x64"
+          $WORKING_DIR=(Get-Location).ToString() -replace "\\","/"
+          cmake -G "Visual Studio 16 2019" -A "x64" `
+          -DCMAKE_INSTALL_PREFIX="$WORKING_DIR/install2" `
+          -DCMAKE_C_FLAGS="/DPCRE2_STATIC" `
+          -DCMAKE_CXX_FLAGS="/DPCRE2_STATIC" `
+          -DPCRE2_INCLUDE_DIR="$PCRE_ROOT/include" `
+          -DPCRE2_LIBRARY="$PCRE_ROOT/lib/pcre2-8-static.lib" `
+          -S . -B build
           cmake --build build --config Release --target install
 
     - name: Test
-      shell: cmd
+      shell: powershell
       working-directory: install2/bin
       run: |
           swig.exe -version