Merge pull request #2 from tailscale/build

build tailscale from source.

Author: DentonGentry

.devcontainer/Dockerfile

@@ -2,17 +2,21 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-FROM mcr.microsoft.com/vscode/devcontainers/universal:linux
+FROM mcr.microsoft.com/vscode/devcontainers/universal:linux as builder
+USER root
+
+WORKDIR /go/src/tailscale
+COPY . ./
+RUN git clone https://github.com/tailscale/tailscale.git && cd tailscale && \
+    git checkout dgentry/dns-copy && go mod download && \
+    go install -mod=readonly ./cmd/tailscaled ./cmd/tailscale
+COPY . ./
 
+FROM mcr.microsoft.com/vscode/devcontainers/universal:linux
 USER root
 
 COPY tailscaled /etc/init.d
+COPY --from=builder /go/bin/tailscaled /usr/sbin/tailscaled
+COPY --from=builder /go/bin/tailscale /usr/bin/tailscale
 
-RUN apt update && apt install -y curl gpg
-
-RUN curl https://pkgs.tailscale.com/stable/ubuntu/focal.gpg | apt-key add
-RUN curl https://pkgs.tailscale.com/stable/ubuntu/focal.list | tee /etc/apt/sources.list.d/tailscale.list
-RUN apt update && \
-    export DEBIAN_FRONTEND=noninteractive && \
-    apt -y install --no-install-recommends tailscale
 RUN mkdir -p /var/run/tailscale /var/cache/tailscale /var/lib/tailscale