Add GitHub CLI installation to Dockerfile (#1286)

Co-authored-by: openhands <openhands@all-hands.dev>

Author: xingyaoww

openhands-agent-server/openhands/agent_server/docker/Dockerfile

@@ -156,6 +156,18 @@ RUN set -eux; \
 RUN mkdir -p /etc/docker && \
     echo '{"mtu": 1450}' > /etc/docker/daemon.json
 
+# --- GitHub CLI ---
+RUN set -eux; \
+    mkdir -p -m 755 /etc/apt/keyrings; \
+    wget -nv -O /etc/apt/keyrings/githubcli-archive-keyring.gpg \
+        https://cli.github.com/packages/githubcli-archive-keyring.gpg; \
+    chmod go+r /etc/apt/keyrings/githubcli-archive-keyring.gpg; \
+    echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" \
+        > /etc/apt/sources.list.d/github-cli.list; \
+    apt-get update; \
+    apt-get install -y gh; \
+    apt-get clean; \
+    rm -rf /var/lib/apt/lists/*
 
 # --- VNC + Desktop + noVNC ---
 RUN set -eux; \