Add build workflow

.github/workflows/build.yml

@@ -0,0 +1,65 @@
+name: Build android and ios
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    name: Build ios and android packages
+    runs-on: macos-latest
+
+    steps:
+      - name: Set up Go 1.22
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.22"
+
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+
+      - name: Install flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.24.1'
+
+      - name: Check out code
+        uses: actions/checkout@v3
+
+
+      - name: install dependencies
+        env:
+          TOKEN: ${{ secrets.MACHINE_USER_PAT }}
+        run: |
+          go install golang.org/x/mobile/cmd/gomobile@latest
+          gomobile init
+
+          flutter pub get
+
+          touch env.sh
+
+#      - name: Build iOS
+#        env:
+#          TOKEN: ${{ secrets.MACHINE_USER_PAT }}
+#          MATCH_PASSWORD: ${{ secrets.MATCH_PASSWORD }}
+#        run: |
+#          cd ios
+#          pod install
+#          fastlane build
+#          cd -
+#
+#          # verify that the github token didn't make it into the output
+#          mkdir -p build/app/test-ios
+#          cp ios/MobileNebula.ipa build/app/test-ios
+#          cd build/app/test-ios
+#          unzip MobileNebula.ipa
+#          if find . | xargs strings 2>/dev/null | grep -qF "${TOKEN}" ; then
+#            echo "Token found in iOS build"
+#            exit 1
+#          fi
+
+      - name: Build Android
+        run: flutter build appbundle --debug