support load env from file.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.gitignore

@@ -25,3 +25,4 @@ _testmain.go
 vendor
 drone-telegram
 coverage.txt
+.env

README.md

@@ -83,3 +83,13 @@ docker run --rm \
   -w $(pwd) \
   appleboy/drone-telegram
 ```
+
+Load all environments from file.
+
+```bash
+docker run --rm \
+  -e ENV_FILE=your_env_file_path \
+  -v $(pwd):$(pwd) \
+  -w $(pwd) \
+  appleboy/drone-telegram
+```

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 
+	"github.com/joho/godotenv"
 	_ "github.com/joho/godotenv/autoload"
 	"github.com/urfave/cli"
 )
@@ -156,11 +157,20 @@ func main() {
 			Usage:  "job finished",
 			EnvVar: "DRONE_JOB_FINISHED",
 		},
+		cli.StringFlag{
+			Name:   "env-file",
+			Usage:  "source env file",
+			EnvVar: "ENV_FILE",
+		},
 	}
 	app.Run(os.Args)
 }
 
 func run(c *cli.Context) error {
+	if c.String("env-file") != "" {
+		_ = godotenv.Load(c.String("env-file"))
+	}
+
 	plugin := Plugin{
 		Repo: Repo{
 			Owner: c.String("repo.owner"),