Add Dockerfile and railway.toml for Railway deployment

Enables one-click deployment to Railway for remote code-server access
from mobile devices. Uses the official install script, binds to the
Railway-provided PORT, and includes a health check endpoint.

https://claude.ai/code/session_01Famw4SjSWr4tECPrC6Z3ef

Dockerfile

@@ -0,0 +1,39 @@
+FROM debian:12
+
+RUN apt-get update && apt-get install -y \
+    curl \
+    dumb-init \
+    git \
+    git-lfs \
+    htop \
+    locales \
+    man-db \
+    nano \
+    openssh-client \
+    procps \
+    sudo \
+    vim-tiny \
+    wget \
+    zsh \
+  && git lfs install \
+  && rm -rf /var/lib/apt/lists/*
+
+# Set locale
+RUN sed -i "s/# en_US.UTF-8/en_US.UTF-8/" /etc/locale.gen && locale-gen
+ENV LANG=en_US.UTF-8
+
+# Install code-server
+RUN curl -fsSL https://code-server.dev/install.sh | sh
+
+# Create coder user
+RUN adduser --gecos '' --disabled-password coder \
+  && echo "coder ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/nopasswd
+
+USER coder
+WORKDIR /home/coder
+
+# Railway sets PORT; default to 8080
+ENV PORT=8080
+
+# Use shell form so $PORT is expanded at runtime
+ENTRYPOINT ["/bin/sh", "-c", "exec dumb-init code-server --bind-addr 0.0.0.0:${PORT}"]

railway.toml

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+[build]
+builder = "DOCKERFILE"
+dockerfilePath = "Dockerfile"
+
+[deploy]
+healthcheckPath = "/healthz"
+restartPolicyType = "ON_FAILURE"
+restartPolicyMaxRetries = 10