Use dotenv and method config::Config::from_env

Cargo.lock

@@ -337,6 +337,12 @@ dependencies = [
  "generic-array 0.12.3",
 ]
 
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
+
 [[package]]
 name = "error-chain"
 version = "0.12.4"
@@ -359,6 +365,7 @@ version = "0.0.0"
 dependencies = [
  "bcrypt",
  "diesel",
+ "dotenv",
  "r2d2",
  "regex",
  "rocket",

Cargo.toml

@@ -14,6 +14,7 @@ publish = true
 
 [dependencies]
 bcrypt = "0.8.2"
+dotenv = "0.15.0"
 r2d2 = "0.8.9"
 regex = "1.4.1"
 rocket = "0.4.5"

src/main.rs

@@ -17,6 +17,7 @@ mod forms;
 extern crate rocket_contrib;
 
 fn main() {
-    let config = config::Config::default().unwrap();
+    dotenv::dotenv().unwrap();
+    let config = config::Config::from_env().unwrap();
     web::rocket(config).launch();
 }