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-comment.yml

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+name: Comment
+
+on:
+  workflow_run:
+    workflows: [ Build ]
+    types:
+      - completed
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request'
+    steps:
+      - name: Download artifact
+        uses: actions/github-script@v7
+        with:
+          script: |
+            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "pr"
+            })[0];
+            var download = await github.rest.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchArtifact.id,
+               archive_format: 'zip',
+            });
+            var fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));
+      - run: unzip pr.zip
+
+      - name: Build success
+        if: ${{ github.event.workflow_run.conclusion == 'success' }}
+        uses: actions/github-script@v7
+        with:
+          script: |
+            var fs = require('fs')
+            var issue_number = Number(fs.readFileSync('./NR'));
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
+               owner,
+               repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "apk-files"
+            })[0];
+            const artifact_url = `https://github.com/${owner}/${repo}/actions/runs/${{ github.event.workflow_run.id }}/artifacts/${matchArtifact.id}`;
+
+            const comments = await github.rest.issues.listComments({
+              owner,
+              repo,
+              issue_number
+            });
+
+            let comment_id;
+            for (const comment of comments.data) {
+              if (comment.user.login === 'github-actions[bot]') {
+                comment_id = comment.id;
+                break;
+              }
+            }
+
+            const body = `Build successful. APKs to test: ${artifact_url}`;
+
+            if (comment_id) {
+              await github.rest.issues.updateComment({
+                owner,
+                repo,
+                comment_id,
+                body
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner,
+                repo,
+                issue_number,
+                body
+              });
+            }
+
+      - name: Build failed
+        if: ${{ github.event.workflow_run.conclusion == 'failure' }}
+        uses: actions/github-script@v7
+        with:
+          script: |
+            var fs = require('fs')
+            var issue_number = Number(fs.readFileSync('./NR'));
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+
+            const comments = await github.rest.issues.listComments({
+              owner,
+              repo,
+              issue_number
+            });
+
+            let comment_id;
+            for (const comment of comments.data) {
+              if (comment.user.login === 'github-actions[bot]') {
+                comment_id = comment.id;
+                break;
+              }
+            }
+
+            const body = `Build failed`;
+
+            if (comment_id) {
+              await github.rest.issues.updateComment({
+                owner,
+                repo,
+                comment_id,
+                body
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner,
+                repo,
+                issue_number,
+                body
+              });
+            }

.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