Created "Build Prod .ipa" workflow

.github/scripts/restore_from_base64.sh

@@ -0,0 +1,14 @@
+content="$1"
+filename="$2"
+
+if [[ ! -n "$content" ]]; then
+    echo "Provide file content"
+    exit 1
+fi
+
+if [[ ! -n "$filename" ]]; then
+    echo "Provide a path to an output file"
+    exit 1
+fi
+
+echo -n "$content" | base64 --decode --output "$filename"

.github/workflows/build_ipa.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Build Prod .ipa
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build .ipa
+    runs-on: macos-11
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Connect private iap package
+        uses: webfactory/ssh-agent@v0.8.0
+        with:
+          ssh-private-key: ${{ secrets.M3_LIGHTMETER_IAP_KEY }}
+
+      - uses: actions/setup-java@v2
+        with:
+          distribution: "zulu"
+          java-version: "11"
+
+      - name: Install Apple Certificate
+        uses: apple-actions/import-codesign-certs@v1
+        with:
+          p12-file-base64: ${{ secrets.CERT_P12 }}
+          p12-password: ${{ secrets.CERT_P12_PASSWORD }}
+      - name: Install the provisioning profile
+        run: |
+          bash .github/scripts/restore_from_base64.sh "${{ secrets.PROVISION_PROD }}" "provision_prod.mobileprovision"
+          mkdir -p ~/Library/MobileDevice/profiles
+          cp app_store_api_key.p8 ~/Library/MobileDevice/profiles
+      - name: Restore AppStore Certificate
+        run: |
+          bash .github/scripts/restore_from_base64.sh "${{ secrets.CERT_P8 }}" "app_store_api_key.p8"
+          mkdir -p ~/Library/MobileDevice/certificates
+          cp app_store_api_key.p8 ~/Library/MobileDevice/certificates
+
+      - name: Restore firebase_options.dart
+        run: bash .github/scripts/restore_from_base64.sh "${{ secrets.FIREBASE_OPTIONS }}" "lib/firebase_options.dart"
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+          flutter-version: '3.10.0'
+
+      - name: Prepare flutter project
+        run: | 
+          flutter --version
+          flutter pub get
+          flutter pub run intl_utils:generate
+
+      - name: Build .ipa
+        env:
+          FLAVOR: ${{ github.event.inputs.flavor }}
+        run: flutter build ipa --release --flavor $FLAVOR -t lib/main_$FLAVOR.dart
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: m3_lightmeter_${{ github.event.inputs.flavor }}_ipa
+          path: build/ios/ipa/lightmeter.ipa