runtime: bump holon-base to Node 20 and update default image

Author: jolestar

docker/holon-base/Dockerfile

@@ -27,8 +27,6 @@ RUN apt-get update && \
       python3 \
       python3-pip \
       python3-venv \
-      nodejs \
-      npm \
       jq \
       ripgrep \
       fd-find \
@@ -40,6 +38,12 @@ RUN apt-get update && \
       unzip \
       xz-utils \
       gh && \
+    mkdir -p /etc/apt/keyrings && \
+    curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg && \
+    chmod a+r /etc/apt/keyrings/nodesource.gpg && \
+    echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_20.x nodistro main" > /etc/apt/sources.list.d/nodesource.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends nodejs && \
     locale-gen en_US.UTF-8 && \
     update-ca-certificates && \
     rm -rf /var/lib/apt/lists/*

pkg/image/detect.go

@@ -14,7 +14,7 @@ import (
 )
 
 // DefaultImage is the fallback Docker image used when no language signal is detected.
-const DefaultImage = "ghcr.io/holon-run/holon-base:0.1.0"
+const DefaultImage = "ghcr.io/holon-run/holon-base:0.2.0"
 
 // Detector detects the appropriate Docker base image for a workspace.
 type Detector struct {