Build of MacOS app bundle NanoVNASaver.app (#634)

* add icon for MacOS based on icon_48x48.png
* add macos build script to build NanoVNASaver.app for current architecture
* add releas app action to build: NanoVNASaver.app-x86_64.tar.gz action

.github/workflows/release_macos_app.yml

@@ -0,0 +1,43 @@
+name: Mac Release App
+
+on:
+  push:
+    tags:
+      - v*
+  workflow_dispatch:
+
+jobs:
+  release:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.11
+    - name: Get Target Environment
+      id: targetenv
+      run: |        
+        echo "arch=`uname -m`" >> "$GITHUB_ENV"
+
+    - name: Install dependencies and pyinstall
+      run: |
+        python -m pip install pip==23.0.1 setuptools==67.6.0
+        pip install -r requirements.txt
+        pip install PyInstaller==5.9.0
+
+    - name: Build binary
+      run: |
+        python setup.py -V        
+        pyinstaller --onedir -p src -n NanoVNASaver nanovna-saver.py --window --clean  -y -i icon_48x48.icns
+        tar -C dist -zcf ./dist/NanoVNASaver.app-${{ env.arch }}.tar.gz  NanoVNASaver.app
+        echo "Created: NanoVNASaver.app-${{ env.arch }}.tar.gz"
+
+    - name: Archive production artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: NanoVNASaver.app-${{ env.arch }}.tar.gz
+        path: dist/NanoVNASaver.app-${{ env.arch }}.tar.gz

build-macos-app.sh

@@ -0,0 +1,21 @@
+# Builds a NanoVNASaver.app on MacOS
+# ensure you have pyqt >=6.4 installed (brew install pyqt)
+#
+export VENV_DIR=macbuildenv
+
+# setup build venv
+python3 -m venv ${VENV_DIR}
+. ./${VENV_DIR}/bin/activate
+
+# install required dependencies (pyqt libs must be installed on the system)
+python3 -m pip install pip==23.0.1 setuptools==67.6.0
+pip install -r requirements.txt
+pip install PyInstaller==5.9.0
+
+python3 setup.py -V
+
+pyinstaller --onedir -p src -n NanoVNASaver nanovna-saver.py --window --clean  -y -i icon_48x48.icns
+tar -C dist -zcf ./dist/NanoVNASaver.app-`uname -m`.tar.gz  NanoVNASaver.app
+
+deactivate
+rm -rf ${VENV_DIR}