refactor: refactor codebase for improved compatibility and efficiency

- Replace `ioutil.ReadAll` with `io.ReadAll` in `jenkins.go`
- Ignore the return value of `godotenv.Load` in `main.go`
- Ignore the return value of `godotenv.Overload` in `main.go`

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

jenkins.go

@@ -3,7 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -58,7 +58,7 @@ func (jenkins *Jenkins) parseResponse(resp *http.Response, body interface{}) (er
 		return
 	}
 
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return
 	}

main.go

@@ -14,11 +14,11 @@ var Version string
 func main() {
 	// Load env-file if it exists first
 	if filename, found := os.LookupEnv("PLUGIN_ENV_FILE"); found {
-		godotenv.Load(filename)
+		_ = godotenv.Load(filename)
 	}
 
 	if _, err := os.Stat("/run/drone/env"); err == nil {
-		godotenv.Overload("/run/drone/env")
+		_ = godotenv.Overload("/run/drone/env")
 	}
 
 	app := cli.NewApp()