feat: add GitHub Actions workflow to build Windows EXE on every push

Agent-Logs-Url: https://github.com/masilver99/sierra-chart-tear-sheet/sessions/2de32610-779d-412d-97b5-83c7d63bd9a8

Co-authored-by: masilver99 <14352629+masilver99@users.noreply.github.com>

Author: Copilot

.github/workflows/build-windows-exe.yml

@@ -0,0 +1,42 @@
+name: Build Windows EXE
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+    branches:
+      - "**"
+
+jobs:
+  build-windows-exe:
+    name: Build tearsheet.exe
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: "pip"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install pyinstaller
+
+      - name: Build EXE with PyInstaller
+        run: |
+          pyinstaller --onefile --name tearsheet --noconfirm tearsheet/__main__.py
+
+      - name: Upload EXE artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: tearsheet-windows-exe
+          path: dist/tearsheet.exe
+          if-no-files-found: error
+          retention-days: 30