refactor: improve code quality and efficiency in various files (#548)

- Replace loadConfig() with _ = loadConfig()
- Update file permissions from 0660 to 0o660
- Simplify variable declarations
- Replace golang.org/x/crypto/ssh/terminal with golang.org/x/term
- Remove unused getCertPrincipals function
- Replace time.Now().Sub() with time.Since()
- Add test for ArgToIndex function

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

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/548
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.io>
Co-authored-by: appleboy <appleboy.tw@gmail.com>
Co-committed-by: appleboy <appleboy.tw@gmail.com>

modules/utils/parse.go

@@ -24,10 +24,7 @@ func ArgsToIndices(args []string) ([]int64, error) {
 
 // ArgToIndex take issue/pull index as string and return int64
 func ArgToIndex(arg string) (int64, error) {
-	if strings.HasPrefix(arg, "#") {
-		arg = arg[1:]
-	}
-	return strconv.ParseInt(arg, 10, 64)
+	return strconv.ParseInt(strings.TrimPrefix(arg, "#"), 10, 64)
 }
 
 // NormalizeURL normalizes the input with a protocol