feat: add tailscale example image

images/tailscale/Dockerfile

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+FROM codercom/enterprise-base:ubuntu
+USER root
+
+# Copy configuration files to appropriate locations
+COPY files /
+ARG DEBIAN_FRONTEND="noninteractive"
+
+RUN apt-get update && \
+    apt-get install --no-install-recommends --yes --quiet \
+      netcat-openbsd \
+      proxychains4 \
+      python3 && \
+    apt-get install --no-install-recommends --yes --quiet \
+      tailscale && \
+    # Delete package cache to avoid consuming space in layer
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+USER coder
+
+ENV ALL_PROXY=socks5://localhost:1080
+ENV http_proxy=http://localhost:3128

images/tailscale/README.md

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+# enterprise-tailscale
+
+An image with [Tailscale networking](https://tailscale.com/) installed for use inside
+Coder workspaces, so that you can access services running inside Coder as well
+as other services running on your [tailnet (Tailscale private network)](https://tailscale.com/kb/1136/tailnet/).
+
+See the guide in our docs for more details: <https://coder.com/docs/coder/latest/customization/tailscale>

images/tailscale/files/etc/apt/preferences.d/tailscale

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+# Ignore all packages from this repository by default
+Package: *
+Pin: origin pkgs.tailscale.com
+Pin-Priority: 1
+Package: tailscale
+Pin: origin pkgs.tailscale.com
+Pin-Priority: 500

images/tailscale/files/etc/apt/sources.list.d/tailscale.list

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+# Tailscale packages for ubuntu focal
+deb [signed-by=/usr/share/keyrings/tailscale.gpg] https://pkgs.tailscale.com/stable/ubuntu focal main

images/tailscale/files/etc/systemd/system/tailscaled.service.d/tailscale.conf

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+[Service]
+ExecStart=
+ExecStart=-/usr/sbin/tailscaled --state=/home/coder/.config/tailscaled.state --socket=/var/run/tailscale/tailscaled.sock --port $PORT --tun=userspace-networking --socks5-server=localhost:1080 --outbound-http-proxy-listen=localhost:3128 $FLAGS