multi: add release helper docker file

make/builder.Dockerfile

@@ -0,0 +1,34 @@
+# If you change this value, please change it in the following files as well:
+# /.travis.yml
+# /Dockerfile
+# /dev.Dockerfile
+# /.github/workflows/main.yml
+# /.github/workflows/release.yml
+FROM golang:1.15.6-buster
+
+MAINTAINER Olaoluwa Osuntokun <laolu@lightning.engineering>
+
+# Golang build related environment variables that are static and used for all
+# architectures/OSes.
+ENV GODEBUG netdns=cgo
+ENV GO111MODULE=auto
+ENV CGO_ENABLED=0
+
+# Set up cache directories. Those will be mounted from the host system to speed
+# up builds. If go isn't installed on the host system, those will fall back to
+# temp directories during the build (see make/release_flags.mk).
+ENV GOCACHE=/tmp/build/.cache
+ENV GOMODCACHE=/tmp/build/.modcache
+
+RUN apt-get update && apt-get install -y \
+    git \
+    make \
+    tar \
+    zip \
+    bash \
+  && mkdir -p /tmp/build/lnd \
+  && mkdir -p /tmp/build/.cache \
+  && mkdir -p /tmp/build/.modcache \
+  && chmod -R 777 /tmp/build/
+
+WORKDIR /tmp/build/lnd

make/release_flags.mk

@@ -1,6 +1,16 @@
 VERSION_TAG = $(shell date +%Y%m%d)-01
 VERSION_CHECK = @$(call print, "Building master with date version tag")
 
+DOCKER_RELEASE_HELPER = docker run \
+  -it \
+  --rm \
+  --user $(shell id -u):$(shell id -g) \
+  -v $(shell pwd):/tmp/build/lnd \
+  -v $(shell bash -c "go env GOCACHE || (mkdir -p /tmp/go-cache; echo /tmp/go-cache)"):/tmp/build/.cache \
+  -v $(shell bash -c "go env GOMODCACHE || (mkdir -p /tmp/go-modcache; echo /tmp/go-modcache)"):/tmp/build/.modcache \
+  -e SKIP_VERSION_CHECK \
+  lnd-release-helper
+
 BUILD_SYSTEM = darwin-amd64 \
 dragonfly-amd64 \
 freebsd-386 \