chore: configure workflows for Flutter app

.github/actions/android/action.yml

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+name: "Android Workflow"
+
+inputs:
+  STORE_PASS:
+    description: 'Store Password'
+    required: false
+    default: ''
+  ALIAS:
+    description: 'Certificate Alias'
+    required: false
+    default: ''
+  KEY_PASS:
+    description: 'Key Password'
+    required: false
+    default: ''
+  VERSION_NAME:
+    description: 'Version Name to be used for build'
+    required: false
+    default: '1.0.0'
+  VERSION_CODE:
+    description: 'Version Code to be used for build'
+    required: true
+    default: '1'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Java
+      uses: actions/setup-java@v2
+      with:
+        java-version: 17
+        distribution: 'adopt'
+        cache: 'gradle'
+
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        cache: true
+
+    - name: Build Android APK/AAB
+      shell: bash
+      env:
+        STORE_PASS: ${{ inputs.STORE_PASS }}
+        ALIAS: ${{ inputs.ALIAS }}
+        KEY_PASS: ${{ inputs.KEY_PASS }}
+        VERSION_NAME: ${{inputs.VERSION_NAME}}
+        VERSION_CODE: ${{inputs.VERSION_CODE}}
+      run: |
+        flutter build apk --build-name $VERSION_NAME --build-number $VERSION_CODE
+        flutter build appbundle --build-name $VERSION_NAME --build-number $VERSION_CODE
+
+    - name: Store APK file
+      uses: actions/upload-artifact@v4
+      with:
+        name: apk-files
+        path: |
+          build/app/outputs/flutter-apk

.github/actions/common/action.yml

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+name: "Common Workflow"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        cache: true
+
+    - name: Fetch Flutter Dependencies
+      shell: bash
+      run: flutter pub get
+
+    - name: Validate Code Format
+      shell: bash
+      run: dart format --output=none --set-exit-if-changed .
+
+    - name: Analyze Code
+      shell: bash
+      run: flutter analyze
+
+    - name: Run tests
+      shell: bash
+      run: flutter test

.github/actions/ios/action.yml

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+name: "iOS Workflow"
+
+inputs:
+  VERSION_NAME:
+    description: 'Version Name to be used for build'
+    required: false
+    default: '1.0.0'
+  VERSION_CODE:
+    description: 'Version Code to be used for build'
+    required: true
+    default: '1'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        cache: true
+
+    - name: Build iOS IPA
+      shell: bash
+      env:
+        VERSION_NAME: ${{inputs.VERSION_NAME}}
+        VERSION_CODE: ${{inputs.VERSION_CODE}}
+      run: |
+        flutter build ipa --no-codesign --build-name $VERSION_NAME --build-number $VERSION_CODE

.github/workflows/pull-request.yml

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+name: Build
+
+on:
+  pull_request:
+    branches: ["flutter"]
+
+jobs:
+  common:
+    name: Common Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Common Workflow
+        uses: ./.github/actions/common
+
+      - name: Save PR number
+        run: |
+          mkdir -p ./pr
+          echo ${{ github.event.number }} > ./pr/NR
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: pr
+          path: pr/
+
+  android:
+    name: Android Flutter Build
+    needs: common
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Android Workflow
+        uses: ./.github/actions/android
+
+  ios:
+    name: iOS Flutter Build
+    needs: common
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: iOS Workflow
+        uses: ./.github/actions/ios

.github/workflows/push-event.yml

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+name: Push
+
+on:
+  push:
+    branches: ["flutter"]
+
+jobs:
+  common:
+    name: Common Build
+    runs-on: ubuntu-latest
+    outputs:
+      VERSION_NAME: ${{ steps.flutter-version.outputs.VERSION_NAME }}
+      VERSION_CODE: ${{ steps.flutter-version.outputs.VERSION_CODE }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Common Workflow
+        uses: ./.github/actions/common
+
+      - name: Hydrate and Update Version
+        id: flutter-version
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          
+          git clone --branch=version https://${{ github.repository_owner }}:${{ github.token }}@github.com/${{ github.repository }} version
+          cd version
+
+          # Read and increment version name
+          IFS='.' read -r major minor patch < versionName.txt
+          current_patch_version_name="$major.$minor.$patch"
+          echo "VERSION_NAME=$current_patch_version_name" >> $GITHUB_OUTPUT
+          
+          next_patch=$((patch + 1))
+          next_patch_version_name="$major.$minor.$next_patch"
+          echo "$next_patch_version_name" > versionName.txt
+
+          # Read and increment version code
+          read -r version_code < versionCode.txt
+          echo "VERSION_CODE=$version_code" >> $GITHUB_OUTPUT
+          
+          new_version_code=$((version_code + 1))
+          echo "$new_version_code" > versionCode.txt
+
+          # Force push to version branch
+          git checkout --orphan temporary
+          git add --all .
+          git commit -am "[Auto] Update versionName: $next_patch_version_name & versionCode: $new_version_code ($(date +%Y-%m-%d.%H:%M:%S))"
+          git branch -D version
+          git branch -m version
+          git push --force origin version
+
+  android:
+    name: Android Flutter Build
+    needs: common
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Prepare Build Keys
+        if: ${{ github.repository == 'fossasia/pslab-android' }}
+        env:
+          ENCRYPTED_F10B5E0E5262_IV: ${{ secrets.ENCRYPTED_F10B5E0E5262_IV }}
+          ENCRYPTED_F10B5E0E5262_KEY: ${{ secrets.ENCRYPTED_F10B5E0E5262_KEY }}
+        run: |
+          bash scripts/prep-key.sh
+
+      - name: Android Workflow
+        uses: ./.github/actions/android
+        with:
+          STORE_PASS: ${{ secrets.STORE_PASS }}
+          ALIAS: ${{ secrets.ALIAS }}
+          KEY_PASS: ${{ secrets.KEY_PASS }}
+          VERSION_NAME: ${{needs.common.outputs.VERSION_NAME}}
+          VERSION_CODE: ${{needs.common.outputs.VERSION_CODE}}
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: APK Generated
+          path: build/app/outputs/flutter-apk
+
+      - name: Upload AAB Release
+        uses: actions/upload-artifact@v4
+        with:
+          name: AAB Generated
+          path: build/app/outputs/bundle
+
+      - name: Upload APK/AAB to apk branch
+        if: ${{ github.repository == 'fossasia/pslab-android' }}
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+          git clone --branch=apk https://${{ github.repository_owner }}:${{ github.token }}@github.com/${{ github.repository }} apk
+          cd apk
+          
+          branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}
+
+          echo "Removing previous files from branch"
+
+          rm -rf pslab-$branch*
+
+          ls
+
+          echo "Copying new build files"
+
+          find ../build/app/outputs/flutter-apk -type f \( -name '*.apk' -o -name '*.aab' \) -exec cp -v {} . \;
+          find ../build/app/outputs/bundle -type f \( -name '*.apk' -o -name '*.aab' \) -exec cp -v {} . \;
+
+          ls
+
+          echo "Renaming new build files"
+
+          for file in app*; do
+            mv $file pslab-$branch-${file#*-}
+          done
+
+          ls
+
+          echo "Pushing to apk branch"
+
+          git checkout --orphan temporary
+          git add --all .
+          git commit -am "[Auto] Update APK/AAB's from $branch ($(date +%Y-%m-%d.%H:%M:%S))"
+          git branch -D apk
+          git branch -m apk
+          git push --force origin apk
+
+      - name: Setup Ruby
+        if: ${{ github.repository == 'fossasia/pslab-android' }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+          bundler-cache: true
+
+      - name: Prepare Bundler
+        if: ${{ github.repository == 'fossasia/pslab-android' }}
+        run: |
+          bundle config path vendor/bundle
+          bundle install --jobs 4 --retry 3
+
+      - name: Update app in Closed Testing track
+        if: ${{ github.repository == 'fossasia/pslab-android' }}
+        run: |
+          git clone --branch=fastlane --depth=1 https://${{ github.repository_owner }}:${{ github.token }}@github.com/${{ github.repository }} fastlane
+          bundle exec fastlane uploadToClosedTesting
+          if [[ $? -ne 0 ]]; then
+              exit 1
+          fi
+
+  ios:
+    name: iOS Flutter Build
+    needs: common
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: iOS Workflow
+        uses: ./.github/actions/ios
+        with:
+          VERSION_NAME: ${{needs.common.outputs.VERSION_NAME}}
+          VERSION_CODE: ${{needs.common.outputs.VERSION_CODE}}
+
+  update-release:
+    name: Update Draft Release
+    needs: [common, android, ios]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run Release Drafter
+        uses: release-drafter/release-drafter@v6
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          version: ${{ needs.common.outputs.VERSION_NAME }}