Updating code for leaner automated builds.

Author: xtr0py

Dockerfile

@@ -1,15 +1,22 @@
-FROM golang:alpine as build
-ENV RELEASE_TAG 2.1.15
+FROM golang:alpine AS build
+
+ARG RELEASE_TAG=2.1.15
+ENV RELEASE_TAG=$RELEASE_TAG
+
 RUN apk --no-cache add git && \
-    git clone https://github.com/jedisct1/dnscrypt-proxy /go/src/github.com/jedisct1/ && \
-    cd /go/src/github.com/jedisct1/dnscrypt-proxy && \
-    git checkout tags/${RELEASE_TAG} && \
+    git clone --depth 1 --branch "${RELEASE_TAG}" https://github.com/DNSCrypt/dnscrypt-proxy.git /src && \
+    cd /src && \
     CGO_ENABLED=0 GOOS=linux go install -a -ldflags '-s -w -extldflags "-static"' -v ./...
 
 FROM alpine
+
 RUN apk --no-cache add ca-certificates
+
 COPY --from=build /go/bin/dnscrypt-proxy /usr/local/bin/dnscrypt-proxy
+
 ADD config /config
+
 EXPOSE 53/udp
 
 CMD ["dnscrypt-proxy", "-config", "/config/dnscrypt-proxy.toml"]
+