From 0b86b88de77ae364394bed4455813278bdfbdca9 Mon Sep 17 00:00:00 2001
From: Alex Wigen <alex@wigen.net>
Date: Sun, 22 Mar 2020 22:55:29 +0100
Subject: Remove build dependencies from final docker image (multistage build)
 (#1057)

This multistage build takes the resulting image size down from 346MB to
90MB.
---
 Dockerfile | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index a1b97c73..2f0a1b02 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,13 @@
-FROM alpine:edge
-ENTRYPOINT ["/bin/matterbridge"]
+FROM alpine:edge AS builder
 
 COPY . /go/src/github.com/42wim/matterbridge
-RUN apk update && apk add go git gcc musl-dev ca-certificates mailcap \
+RUN apk update && apk add go git gcc musl-dev \
         && cd /go/src/github.com/42wim/matterbridge \
         && export GOPATH=/go \
         && go get \
-        && go build -x -ldflags "-X main.githash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge \
-        && rm -rf /go \
-        && apk del --purge git go gcc musl-dev
+        && go build -x -ldflags "-X main.githash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
+
+FROM alpine:edge
+RUN apk --no-cache add ca-certificates mailcap
+COPY --from=builder /bin/matterbridge /bin/matterbridge
+ENTRYPOINT ["/bin/matterbridge"]
-- 
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