Fix: install ttyd from static binary (not in Debian repos)

Dockerfile

@@ -10,10 +10,22 @@ ENV DEBIAN_FRONTEND=noninteractive \
 RUN apt-get update && apt-get install -y --no-install-recommends \
         ca-certificates curl wget git jq ripgrep nano vim less \
         build-essential python3 python3-pip python3-venv \
-        nginx supervisor ttyd locales tini \
+        nginx supervisor locales tini \
     && sed -i 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && locale-gen \
     && rm -rf /var/lib/apt/lists/*
 
+# ttyd static binary (not in Debian repos) — pick arch at build time
+RUN set -eux; \
+    arch="$(dpkg --print-architecture)"; \
+    case "$arch" in \
+      amd64) ttyd_arch="x86_64" ;; \
+      arm64) ttyd_arch="aarch64" ;; \
+      *) echo "unsupported arch: $arch"; exit 1 ;; \
+    esac; \
+    curl -fsSL "https://github.com/tsl0922/ttyd/releases/download/1.7.7/ttyd.${ttyd_arch}" -o /usr/local/bin/ttyd; \
+    chmod +x /usr/local/bin/ttyd; \
+    ttyd --version
+
 ENV LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8
 
 # Node.js 20 (NodeSource)