Add workflow to create apk,ipa files

.github/workflows/mail.yaml

@@ -0,0 +1,48 @@
+name: Build Flutter APK's and iPA files
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+    - '*'
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+          architecture: x64
+          cache: true
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+          cache: 'gradle'
+      - name: Run flutter doctor
+        run: flutter doctor -v
+      - name: Run pub get and build runner
+        run: |
+          flutter pub get
+
+      - name: Build APK
+        run: | 
+          flutter build apk --release
+          cd build/app/outputs/apk/release
+          mv *.apk Neumorphic-Calculator-${GITHUB_REF#refs/*/}.apk
+      - name: Build iPA
+        run: |
+          flutter build ios --release --no-codesign
+          cd build/ios/iphoneos
+          mkdir Payload
+          cd Payload
+          ln -s ../Runner.app
+          cd ..
+          zip -r Neumorphic-Calculator-${GITHUB_REF#refs/*/}.ipa Payload
+      - name: Create Release
+        uses: ncipollo/release-action@v1.13.0
+        with:
+          artifacts: "build/app/outputs/apk/release/*.apk,build/ios/iphoneos/*.ipa"
+          allowUpdates: true