Add README, docker-compose and update Makefile

Dockerfile

@@ -1,5 +1,7 @@
 FROM interlegis/alpine-postfix 
 
+LABEL maintainer="Danya Sliusar <[email protected]>"
+
 ADD ./bin/sendmail-http /
 ADD start.sh /
 

Makefile

@@ -1,7 +1,13 @@
+APP_NAME=sendmail-http
+
+
+all: build
+
 build:
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o ./bin/sendmail-http
+	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+		go build -o ./bin/$(APP_NAME)
 clean:
-	rm ./bin/sendmail-http
+	rm ./bin/$(APP_NAME)
 
 docker:
-	docker build -t danyanya/postfix-http .
+	docker build -t danyanya/$(APP_NAME) .

README.md

@@ -1 +1,20 @@
-Simple http to sendmail
+# sendmail http
+
+Simple http server for sendmail (based on postfix alpine)
+
+## Build
+
+Binary can be built by execute:
+
+```
+make build
+
+```
+
+To make docker image exec:
+
+```
+
+make docker
+
+```

docker-compose.yml

@@ -0,0 +1,7 @@
+version: '3.6'
+services:
+    postfix-http:
+        image: danyanya/postfix-http
+        entrypoint: /start.sh
+        environment:
+          - SERVER_ADDR=:1001