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