Document required host directories to prevent root-owned bind mount issues

DOCKER_HUB.md

@@ -116,10 +116,22 @@ The entrypoint automatically detects the owner of `/workspace` and adjusts the c
 
 ## Initial Setup
 
-### 1. Create a project directory
+### 1. Create host directories
+
+Bind-mounted directories must exist on the host before starting the container. Docker creates missing directories as root-owned, which causes permission issues.
 
 ```bash
+# Required
 mkdir -p ~/projects
+
+# If mounting opencode config (recommended for persistent settings)
+mkdir -p ~/.config/opencode
+
+# If using AWS Bedrock
+# mkdir -p ~/.aws
+
+# If mounting neovim config
+# mkdir -p ~/.config/nvim
 ```
 
 ### 2. Create a `.env` file

README.md

@@ -42,6 +42,18 @@ docker compose run --rm devbox
 
 ## Usage
 
+### Prerequisites
+
+Bind-mounted directories must exist on the host before starting the container. Docker creates missing directories as root-owned, which causes permission issues.
+
+```bash
+# Required: workspace for your projects
+mkdir -p ~/projects
+
+# If mounting opencode config (recommended for persistent settings)
+mkdir -p ~/.config/opencode
+```
+
 ### Connecting to the container
 
 From your laptop, SSH into the remote server where Docker is running, then start the container: