Use pub workspace for the dart-pad monorepo

.gitignore

@@ -5,6 +5,7 @@ build/
 .buildlog
 .dart_tool/
 .packages
+pubspec.lock
 
 # Or the files created by dart2js.
 *.dart.js

pkgs/dart_services/pubspec.yaml

@@ -3,7 +3,7 @@ description: The backend service for DartPad.
 publish_to: none
 
 environment:
-  sdk: ^3.4.0
+  sdk: ^3.5.0
 
 dependencies:
   analysis_server_lib: ^0.2.5
@@ -36,6 +36,5 @@ dev_dependencies:
   test: ^1.25.7
   test_descriptor: ^2.0.1
 
-dependency_overrides:
-  dartpad_shared:
-    path: ../dartpad_shared
+# This package is managed as part of the dart-pad workspace.
+resolution: workspace

pkgs/dartpad_shared/pubspec.yaml

@@ -3,7 +3,7 @@ description: Shared code between the DartPad frontend and backend.
 publish_to: none
 
 environment:
-  sdk: ^3.4.0
+  sdk: ^3.5.0
 
 dependencies:
   http: ^1.2.1
@@ -14,3 +14,6 @@ dev_dependencies:
   build_runner: ^2.4.11
   dart_flutter_team_lints: ^3.1.0
   json_serializable: ^6.8.0
+
+# This package is managed as part of the dart-pad workspace.
+resolution: workspace

pkgs/dartpad_ui/pubspec.yaml

@@ -3,7 +3,7 @@ description: The front-end UI of DartPad.
 publish_to: none
 
 environment:
-  sdk: ^3.4.0
+  sdk: ^3.5.0
 
 dependencies:
   collection: any
@@ -41,6 +41,5 @@ flutter:
     - assets/RobotoMono-Bold.ttf
     - assets/RobotoMono-Regular.ttf
 
-dependency_overrides:
-  dartpad_shared:
-    path: ../dartpad_shared
+# This package is managed as part of the dart-pad workspace.
+resolution: workspace

pkgs/samples/pubspec.yaml

@@ -3,7 +3,7 @@ description: Sample code snippets for DartPad.
 publish_to: none
 
 environment:
-  sdk: ^3.4.0
+  sdk: ^3.5.0
 
 dependencies:
   flame: ^1.18.0
@@ -20,3 +20,6 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+# This package is managed as part of the engine workspace.
+resolution: workspace

pubspec.yaml

@@ -0,0 +1,8 @@
+name: _dartpad_workspace
+environment:
+  sdk: ^3.5.0
+workspace:
+  - pkgs/dart_services
+  - pkgs/dartpad_shared
+  - pkgs/dartpad_ui
+  - pkgs/samples