ci: Add missing dependency installation in CI (#833)

Author: mtrezza

.github/workflows/ci.yml

@@ -48,8 +48,8 @@ jobs:
           cache: true
       - name: Install dependencies
         run: |
-          (cd packages/dart; flutter pub get)
-          (cd packages/flutter; flutter pub get)
+          (cd packages/dart && flutter pub get)
+          (cd packages/flutter && flutter pub get)
       - name: Analyze code
         run: flutter analyze packages/flutter --no-fatal-infos
   check-code-analysis-dart:
@@ -79,6 +79,16 @@ jobs:
         uses: subosito/flutter-action@v2
         with:
           cache: true
+      - name: Install dependencies on Ubuntu and MacOS
+        if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
+        run: |
+          (cd packages/dart && flutter pub get)
+          (cd packages/flutter && flutter pub get)
+      - name: Install dependencies on Windows
+        if: matrix.os == 'windows-latest'
+        run: |
+          cmd /c "cd packages\dart && flutter pub get"
+          cmd /c "cd packages\flutter && flutter pub get"
       - name: Run tests
         run: (cd packages/flutter && flutter test --coverage)
       - name: Convert code coverage