docs: add mermaid graph to .devcontainer/README.md, remove mount (revert). (#2632)

Co-authored-by: Keiven Chang <keivenchang@users.noreply.github.com>
Signed-off-by: Jason Zhou <jasonzho@jasonzho-mlt.client.nvidia.com>

Author: keivenchang

.devcontainer/README.md

@@ -19,6 +19,56 @@ limitations under the License.
 
 > Warning: Dev Containers (aka `devcontainers`) is an evolving feature and we are not testing in CI. Please submit any problem/feedback using the issues on GitHub.
 
+```mermaid
+graph TB
+    subgraph "Developer Laptop"
+        subgraph IDE["Cursor/VS Code"]
+            EXT["Dev Container Extension"]
+            SSHEXT["Remote-SSH Extension"]
+        end
+        TERM["iTerm/Terminal"]
+    end
+
+    subgraph WS["Linux Workstation"]
+        DIR["~/dynamo<br/>(host directory)"]
+        HFCACHE["~/.cache/huggingface<br/>(host cache)"]
+        GITCONFIG["~/.gitconfig<br/>(host git config)"]
+
+        subgraph CONTAINER["Docker Container<br/>vsc-dynamo-SHA-uid<br/>Running as: ubuntu user"]
+            MOUNT["/home/ubuntu/dynamo<br/>(mounted directory)"]
+            HFMOUNT["/home/ubuntu/.cache/huggingface<br/>(mounted cache)"]
+            GITCONFIGCOPY["/home/ubuntu/.gitconfig<br/>(via Dev Container setting)"]
+            TOOLS["rust-analyzer<br/>cargo<br/>etc."]
+        end
+
+        IMAGE["Docker Image<br/>dynamo:latest-vllm-local-dev"]
+
+        IMAGE -->|"docker run<br/>as ubuntu user"| CONTAINER
+    end
+
+    TERM -->|"SSH Connection"| DIR
+    SSHEXT -->|"1. Remote-SSH"| DIR
+    EXT -->|"2. Dev Container:<br/>Open Folder (via ssh)"| IMAGE
+    EXT -->|"3. IDE/shell via<br/>ssh+docker exec"| CONTAINER
+    DIR <-.->|"Volume Mount<br/>(bidirectional)"| MOUNT
+    HFCACHE <-.->|"Volume Mount<br/>(HF cache)"| HFMOUNT
+    GITCONFIG -->|"Copy"| GITCONFIGCOPY
+
+    style IDE fill:#e1f5fe
+    style EXT fill:#cfe2ff
+    style SSHEXT fill:#cfe2ff
+    style TERM fill:#e1f5fe
+    style DIR fill:#fff3e0
+    style HFCACHE fill:#fff3e0
+    style GITCONFIG fill:#fff3e0
+    style IMAGE fill:#f3e5f5
+    style CONTAINER fill:#d4edda
+    style MOUNT fill:#fff9c4
+    style HFMOUNT fill:#fff9c4
+    style GITCONFIGCOPY fill:#fff9c4
+    style TOOLS fill:#ffebee
+```
+
 ## Prerequisites
 
 Before you begin, ensure you have the following installed:
@@ -42,7 +92,7 @@ Follow these steps to get your NVIDIA Dynamo development environment up and runn
 ### Step 1: Build the Development Container Image
 
 Build `dynamo:latest-vllm-local-dev` from scratch from the source:
-- Note that currently, `local-dev` are only implemented for `--framework VLLM` and `--framework SGLANG`, for now.
+- Note that currently, `local-dev` is only implemented.
 
 ```bash
 ./container/build.sh --target local-dev

.devcontainer/devcontainer.json

@@ -77,7 +77,8 @@
         "source=dynamo-bashhistory,target=/home/ubuntu/.commandhistory,type=volume",
         "source=dynamo-precommit-cache,target=/home/ubuntu/.cache/pre-commit,type=volume",
         // Default mounts
-        "source=/tmp/,target=/tmp/,type=bind",
-        "source=${localEnv:HOME}/.cache/huggingface,target=/home/ubuntu/.cache/huggingface,type=bind"
+        "source=/tmp/,target=/tmp/,type=bind"
+        // Uncomment this to reuse your Hugging Face cache
+        //"source=${localEnv:HOME}/.cache/huggingface,target=/home/ubuntu/.cache/huggingface,type=bind"
     ]
 }

.devcontainer/post-create.sh

@@ -42,11 +42,6 @@ retry() {
 
 set -x
 
-# Changing permission to match local user since volume mounts default to root ownership
-# Note: sudo is used here because the volume mount may have root ownership
-mkdir -p $HOME/.cache
-sudo chown -R ubuntu:ubuntu $HOME/.cache $HOME/dynamo
-
 # Pre-commit hooks
 cd $HOME/dynamo && pre-commit install && retry pre-commit install-hooks
 pre-commit run --all-files || true # don't fail the build if pre-commit hooks fail