Merge pull request rails#54631 from elalemanyo/feature/improve-devcontainer-mount

Improve devcontainer volume mount to only include the app folder

Author: rafaelfranca

railties/lib/rails/generators/rails/devcontainer/templates/devcontainer/compose.yaml.tt

@@ -7,7 +7,7 @@ services:
       dockerfile: .devcontainer/Dockerfile
 
     volumes:
-    - ../..:/workspaces:cached
+    - ../../<%= options[:app_name] %>:/workspaces/<%= options[:app_name] %>:cached
 
     # Overrides default command so things don't shut down after the process ends.
     command: sleep infinity

railties/test/generators/app_generator_test.rb

@@ -1400,7 +1400,7 @@ def test_devcontainer
           "context" => "..",
           "dockerfile" => ".devcontainer/Dockerfile"
         },
-        "volumes" => ["../..:/workspaces:cached"],
+        "volumes" => ["../../#{compose_config["name"]}:/workspaces/#{compose_config["name"]}:cached"],
         "command" => "sleep infinity",
         "depends_on" => ["selenium"]
       }

railties/test/generators/devcontainer_generator_test.rb

@@ -360,7 +360,7 @@ def test_common_config
                 "context" => "..",
                 "dockerfile" => ".devcontainer/Dockerfile"
               },
-              "volumes" => ["../..:/workspaces:cached"],
+              "volumes" => ["../../#{compose["name"]}:/workspaces/#{compose["name"]}:cached"],
               "command" => "sleep infinity"
             }
             actual_independent_config = compose["services"]["rails-app"].except("depends_on")