add docker and environment flag parsing

.dockerignore

@@ -0,0 +1,13 @@
+node_modules
+npm-debug.log
+Dockerfile*
+docker-compose*
+.dockerignore
+.git
+.gitignore
+.gitattributes
+.idea
+README.md
+LICENSE
+.vscode
+Makefile

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

.gitignore

@@ -1 +1,2 @@
 /gitlab-source-link-proxy*
+.idea/

Dockerfile

@@ -0,0 +1,16 @@
+
+#build stage
+FROM golang:stretch AS builder
+ENV GO111MODULE=on
+WORKDIR /go/src
+COPY . .
+RUN go get -v -d .
+RUN go build -o gitlab-source-link-proxy .
+
+#final stage
+FROM ubuntu:latest
+# RUN apk --no-cache add ca-certificates
+COPY --from=builder /go/src /app
+CMD ["/app/gitlab-source-link-proxy"]
+LABEL Name=gitlab-source-link-proxy Version=0.0.1
+EXPOSE 7000

docker-compose.yml

@@ -0,0 +1,11 @@
+version: '3.6'
+
+services:
+  gitlab-source-link-proxy:
+    image: gitlab-source-link-proxy
+    environment:
+      - "GITLAB_BASE_URL=https://gitlab.example.com/"
+      - "LISTEN_ADDRESS=0.0.0.0:7000"
+    build: .
+    ports:
+      - 7000:7000

go.mod

@@ -4,6 +4,7 @@ require (
 	github.com/jamiealquiza/bicache v2.0.0+incompatible
 	github.com/jamiealquiza/fnv v1.0.0 // indirect
 	github.com/jamiealquiza/tachymeter v1.1.2 // indirect
+	github.com/kouhin/envflag v0.0.0-20150818174321-0e9a86061649
 	golang.org/x/crypto v0.0.0-20180830192347-182538f80094
 	golang.org/x/sys v0.0.0-20180831094639-fa5fdf94c789 // indirect
 )

go.sum

@@ -4,6 +4,8 @@ github.com/jamiealquiza/fnv v1.0.0 h1:4NwlkaoZiLhqk008EY5+MTGVPRQZgRG/6B7+jN7ueT
 github.com/jamiealquiza/fnv v1.0.0/go.mod h1:iJRnFlvFvZpWKZd+KljYXcyQLasMIKAVuQhx63P4DUk=
 github.com/jamiealquiza/tachymeter v1.1.2 h1:cOgpMYFejxGSAe5f5JOb7uNPZ53kmEYwwpCrw1vDh2Q=
 github.com/jamiealquiza/tachymeter v1.1.2/go.mod h1:Ayf6zPZKEnLsc3winWEXJRkTBhdHo58HODAu1oFJkYU=
+github.com/kouhin/envflag v0.0.0-20150818174321-0e9a86061649 h1:l95EUBxc0iMtMeam3pHFb9jko9ntaLYe2Nc+2evKElM=
+github.com/kouhin/envflag v0.0.0-20150818174321-0e9a86061649/go.mod h1:BT0PpXv8Y4EL/WUsQmYsQ2FSB9HwQXIuvY+pElZVdFg=
 golang.org/x/crypto v0.0.0-20180830192347-182538f80094 h1:rVTAlhYa4+lCfNxmAIEOGQRoD23UqP72M3+rSWVGDTg=
 golang.org/x/crypto v0.0.0-20180830192347-182538f80094/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/sys v0.0.0-20180831094639-fa5fdf94c789 h1:T8D7l6WB3tLu+VpKvw06ieD/OhBi1XpJmG1U/FtttZg=

main.go

@@ -15,6 +15,7 @@ import (
 	"strings"
 
 	"github.com/jamiealquiza/bicache"
+	"github.com/kouhin/envflag"
 	"golang.org/x/crypto/blake2b"
 )
 
@@ -97,7 +98,9 @@ var (
 )
 
 func main() {
-	flag.Parse()
+	if err := envflag.Parse(); err != nil {
+		panic(err)
+	}
 
 	if *baseGitLabURLFlag == "" {
 		log.Printf("Usage of %s:\n", os.Args[0])