Build from main.

Needed support to write to a bind-mounted /etc/resolv.conf merged
into main.

Author: DentonGentry

.devcontainer/Dockerfile

@@ -10,7 +10,7 @@ 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 mod download && \
     go install -mod=readonly ./cmd/tailscaled ./cmd/tailscale
 COPY . ./