[config]: Use PORT variable instead of HERCULES_PORT

Author: Kshitij Saraogi

Dockerfile

@@ -1,7 +1,7 @@
 FROM golang:1.11
 
 ENV PORT=8080
-ENV DATABASE_URL="user=kshitij10496 dbname=herculesdb sslmode=disable"
+ENV HERCULES_DATABASEURL="user=kshitij10496 dbname=herculesdb sslmode=disable"
 
 RUN mkdir -p /go/src/github.com/kshitij10496/hercules
 WORKDIR /go/src/github.com/kshitij10496/hercules

Gopkg.toml

@@ -29,6 +29,7 @@
   go-version = "1.11"
   install = ["."] # Explicit is better than implicit.
   ensure = true
+  
 
 [[constraint]]
   name = "github.com/lib/pq"

common/config.go

@@ -3,5 +3,5 @@ package common
 // Config represents configuration environment to running application
 type Config struct {
 	DatabaseURL string `required:"true" desc:"Connection String, for more info see: https://godoc.org/github.com/lib/pq"`
-	Port        string `default:"8080" desc:"Application listen port"`
+	Port        string `envconfig:"PORT" default:"8080" desc:"Application listen port"`
 }