Add powershell equivalent for watch files check

.github/workflows/Build_Examples.yml

@@ -35,8 +35,9 @@ jobs:
           ref: '${{ github.event.pull_request.head.ref }}'
           repository: '${{ github.event.pull_request.head.repo.full_name }}'
 
-      - name: Check watch files
-        id: check_watch 
+      - name: Check watch files (bash/zsh)
+        if: ${{ matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'}}
+        id: check_watch
         run: |
           # Determine if we need to run the test
           RUN_TEST=0
@@ -86,6 +87,39 @@ jobs:
           
           echo "RUN_TEST=$RUN_TEST" >> $GITHUB_OUTPUT
           
+      - name: Check watch files (powershell)
+        if: ${{ matrix.os == windows-latest }}
+        run: |
+          $RUN_TEST = 0
+          # Always run test on workflow dispatch
+          if ( $GITHUB_EVENT_NAME -eq "workflow_dispatch" )
+          {
+            $RUN_TEST = 1
+          }
+          else
+          {
+            $WATCH_FILES = "Build_Examples.yml",".c",".cpp",".S",".s",".h",".a",".mk","makefile","Makefile"
+            $CHANGE_FILES = [string](git diff --ignore-submodules --name-only remotes/origin/main)
+            # Check for change files by checking for watched file substrings 
+            # For powershell substring: (https://stackoverflow.com/a/31603685)
+            if ($($WATCH_FILES | %{$CHANGE_FILES.contains($_)}) -contains $true)
+            {
+              echo "Match found."
+              $RUN_TEST = 1
+            }
+          }
+
+          # End the test early if there wasn't a significant change
+          if ( $RUN_TEST -eq 0 )
+          {
+            echo "Skipping Build"
+          }
+          else {
+            echo "Running Build"
+          }
+
+          echo "RUN_TEST=$RUN_TEST" >> $env:GITHUB_OUTPUT
+
       - name: Install ARM GCC Toolchain (arm-none-eabi-gcc)
         uses: carlosperate/arm-none-eabi-gcc-action@v1
         id: arm-none-eabi-gcc-action