add tool to build tailscale debs

tailscale-build/README.md

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+This is a script to build tailscale from source and create a corresponding debian package.
+
+To run:
+
+```
+git clone https://github.com/tailscale/tailscale/
+cd tailscale
+git checkout SOME_VERSION # eg v1.90.0
+bash ../mk-tailscale-deb.sh
+```
+
+A file named `conservancy-tailscale_VERSION_amd64.deb` should be created in the current directory.

tailscale-build/mk-tailscale-deb.sh

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+#!/usr/bin/env bash
+
+set -e
+
+eval "$(./build_dist.sh shellvars)"
+ARCH=amd64
+NAME=conservancy-tailscale
+
+echo "[ ] packaging ${NAME}_${VERSION_SHORT}_${ARCH}.deb"
+
+./build_dist.sh tailscale.com/cmd/tailscale
+./build_dist.sh tailscale.com/cmd/tailscaled
+
+go run ./cmd/mkpkg \
+    --out=${NAME}_${VERSION_SHORT}_${ARCH}.deb \
+    --name=${NAME} \
+    --version=${VERSION_SHORT} \
+    --type=deb \
+    --arch=${ARCH} \
+    --postinst=./release/deb/debian.postinst.sh \
+    --postrm=./release/deb/debian.postrm.sh \
+    --prerm=./release/deb/debian.prerm.sh \
+    --description="The easiest, most secure, cross platform way to use WireGuard + oauth2 + 2FA/SSO" \
+    --configs=./cmd/tailscaled/tailscaled.defaults:/etc/default/tailscaled \
+    --files=./tailscale:/usr/bin/tailscale,./tailscaled:/usr/sbin/tailscaled,./cmd/tailscaled/tailscaled.service:/lib/systemd/system/tailscaled.service