fix: explicitly tell uv to copy when using devcontainer (#32267)

Author: mdrxy

.devcontainer/devcontainer.json

@@ -1,55 +1,58 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-docker-compose
 {
-	// Name for the dev container
-	"name": "langchain",
-	// Point to a Docker Compose file
-	"dockerComposeFile": "./docker-compose.yaml",
-	// Required when using Docker Compose. The name of the service to connect to once running
-	"service": "langchain",
-	// The optional 'workspaceFolder' property is the path VS Code should open by default when
-	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
-	"workspaceFolder": "/workspaces/langchain",
+  // Name for the dev container
+  "name": "langchain",
+  // Point to a Docker Compose file
+  "dockerComposeFile": "./docker-compose.yaml",
+  // Required when using Docker Compose. The name of the service to connect to once running
+  "service": "langchain",
+  // The optional 'workspaceFolder' property is the path VS Code should open by default when
+  // connected. This is typically a file mount in .devcontainer/docker-compose.yml
+  "workspaceFolder": "/workspaces/langchain",
   "mounts": [
     "source=langchain-workspaces,target=/workspaces/langchain,type=volume"
   ],
-	// Prevent the container from shutting down
-	"overrideCommand": true,
-	// Features to add to the dev container. More info: https://containers.dev/features
-	"features": {
-		"ghcr.io/devcontainers/features/git:1": {},
-		"ghcr.io/devcontainers/features/github-cli:1": {}
-	},
-	// Use 'forwardPorts' to make a list of ports inside the container available locally.
-	// "forwardPorts": [],
-	// Run commands after the container is created
-	"postCreateCommand": "uv sync && echo 'LangChain (Python) dev environment ready!'",
-	// Configure tool-specific properties.
-	"customizations": {
-		"vscode": {
-			"extensions": [
-				"ms-python.python",
-				"ms-python.debugpy",
-				"ms-python.mypy-type-checker",
-				"ms-python.isort",
-				"unifiedjs.vscode-mdx",
-				"davidanson.vscode-markdownlint",
-				"ms-toolsai.jupyter",
-				"GitHub.copilot",
-				"GitHub.copilot-chat"
-			],
-			"settings": {
-				"python.defaultInterpreterPath": ".venv/bin/python",
-				"python.formatting.provider": "none",
-				"[python]": {
-					"editor.formatOnSave": true,
-					"editor.codeActionsOnSave": {
-						"source.organizeImports": true
-					}
-				}
-			}
-		}
-	}
-	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
-	// "remoteUser": "root"
-}
+  // Prevent the container from shutting down
+  "overrideCommand": true,
+  // Features to add to the dev container. More info: https://containers.dev/features
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {},
+    "ghcr.io/devcontainers/features/github-cli:1": {}
+  },
+  "containerEnv": {
+    "UV_LINK_MODE": "copy"
+  },
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+  // Run commands after the container is created
+  "postCreateCommand": "uv sync && echo 'LangChain (Python) dev environment ready!'",
+  // Configure tool-specific properties.
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "ms-python.debugpy",
+        "ms-python.mypy-type-checker",
+        "ms-python.isort",
+        "unifiedjs.vscode-mdx",
+        "davidanson.vscode-markdownlint",
+        "ms-toolsai.jupyter",
+        "GitHub.copilot",
+        "GitHub.copilot-chat"
+      ],
+      "settings": {
+        "python.defaultInterpreterPath": ".venv/bin/python",
+        "python.formatting.provider": "none",
+        "[python]": {
+          "editor.formatOnSave": true,
+          "editor.codeActionsOnSave": {
+            "source.organizeImports": true
+          }
+        }
+      }
+    }
+  }
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root"
+}