Use multi stage dockerfile for building

This also adds a docker-compose.yml for easy running and rebuilding

Signed-off-by: Felix Bartels <felix@host-consultants.de>

.dockerignore

@@ -0,0 +1,3 @@
+.dockerignore
+.git
+Dockerfile

Dockerfile

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+FROM golang:1.15-alpine3.12 as builder
+
+WORKDIR /build
+
+RUN apk add git
+RUN go get github.com/GeertJohan/go.rice/rice
+
+COPY go.* ./
+RUN go mod download
+COPY . .
+
+RUN rice embed-go
+RUN CGO_ENABLED=0 go build
+
+FROM scratch
+EXPOSE 80 443
+
+COPY --from=builder /build/boringproxy /
+
+ENTRYPOINT ["/boringproxy"]
+CMD ["server"]

docker-compose.yml

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+version: '3.5'
+services:
+  boringproxy:
+    build: ./
+    image: boringproxy
+    ports:
+      - "80:80"
+      - "443:443"

docker/Dockerfile

@@ -1,14 +0,0 @@
-FROM ubuntu:16.04
-
-RUN apt-get update && apt-get install -y curl git
-
-RUN git clone https://github.com/boringproxy/boringproxy
-WORKDIR boringproxy
-RUN ./install_go.sh
-ENV PATH="${PATH}:/usr/local/go/bin"
-ENV PATH="${PATH}:/root/go/bin"
-RUN go get github.com/GeertJohan/go.rice/rice
-RUN rice embed-go
-RUN go build
-
-CMD ./boringproxy server