feat(lnd): add lnd release scripts

Add the scripts that we have been using to create lnd releases and
document how to use them.

internals/scripts/lnd-release/.goreleaser.yml

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+builds:
+- goos:
+  - linux
+  - darwin
+  - windows
+  goarch:
+  - amd64
+  - "386"
+  ldflags:
+   - -X main.Commit={{.Commit}}
+  flags:
+   - -tags="experimental"
+- goos:
+  - linux
+  - darwin
+  - windows
+  goarch:
+  - amd64
+  - "386"
+  binary: lncli
+  main: ./cmd/lncli
+  ldflags:
+   - -X main.Commit={{.Commit}}
+  flags:
+   - -tags="experimental"
+archive:
+  name_template: '{{ .ProjectName }}-{{ .Os }}-{{ .Arch }}-v{{ .Version }}'
+  format: tar.gz
+  format_overrides:
+      - goos: windows
+        format: zip
+  files:
+  - none*
+  wrap_in_directory: true
+checksum:
+  name_template: 'manifest-{{ .Version }}.txt'
+snapshot:
+  name_template: SNAPSHOT-{{.Commit}}
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'
+sign:
+   artifacts: checksum
+git:
+  short_hash: true
+release:
+  github:
+    owner: LN-Zap
+    name: lnd
+  prerelease: true
+  name_template: "{{.ProjectName}} v{{.Version}}"
+before:
+  hooks:
+    - make clean
+    - make dep

internals/scripts/lnd-release/README.md

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+# lnd-release
+
+We use [GoReleaser](https://goreleaser.com/) to build and publish the lnd binaries that we distribute with Zap Desktop. These are the steps to create a new release.
+
+### 1. Install GoReleaser
+
+See https://goreleaser.com/
+
+### 2. Fetch lnd
+
+Fetch the lnd source code.
+
+```
+go get -d github.com/lightningnetwork/lnd
+```
+
+### 3. Copy release scripts
+
+Copy the scripts provided in `internals/scripts/lnd-release` over to the lnd working dir.
+
+```
+cp .goreleaser.yml $GOPATH/src/github.com/lightningnetwork/lnd/
+cp canary.sh $GOPATH/src/github.com/lightningnetwork/lnd/
+```
+
+### 4. Create new release
+
+Run the provided release script, which will create a new git tag and then build and publish the lnd binaries.
+
+```
+cd $GOPATH/src/github.com/lightningnetwork/lnd
+GITHUB_TOKEN=... ./canary.sh
+```
+
+You must set `GITHUB_TOKEN` to a github access token that has the ability to publish releases on the https://github.com/LN-Zap/lnd repo.
+
+### 5. Verify the new release
+
+Verify that the new build has been published to https://github.com/LN-Zap/lnd/releases

internals/scripts/lnd-release/canary.sh

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+#!/bin/bash
+
+git tag `git describe` || true
+goreleaser release --rm-dist --skip-validate