Update python-app.yml

Author: ejklock

.github/workflows/python-app.yml

@@ -22,7 +22,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest pyinstaller
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        if (Test-Path requirements.txt) { pip install -r requirements.txt }
+      shell: pwsh
     - name: Lint with flake8
       run: |
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
@@ -39,10 +40,11 @@ jobs:
       if: matrix.os == 'ubuntu-latest'
       id: create_tag
       run: |
-        VERSION=$(date +"%Y%m%d%H%M%S")
-        echo "VERSION=$VERSION" >> $GITHUB_ENV
+        $VERSION = Get-Date -Format "yyyyMMddHHmmss"
+        echo "VERSION=$VERSION" >> $env:GITHUB_ENV
         git tag $VERSION
         git push origin $VERSION
+      shell: pwsh
     - name: Create GitHub Release
       if: matrix.os == 'ubuntu-latest'
       uses: softprops/action-gh-release@v1