feat : (#35) modify token related logic to CreateGithubTokenService

Author: coehgns

src/main/kotlin/entry/dsm/gitauth/equusgithubauth/domain/auth/command/service/CreateGithubTokenService.kt

@@ -11,15 +11,14 @@ class CreateGithubTokenService(
     private val githubProperties: GithubProperties,
 ) {
     companion object {
-        private const val ACCESS_TOKEN_URL = "https://github.com/login/oauth/access_token"
         private val restTemplate = RestTemplate()
     }
 
     fun execute(
         code: String
     ): TokenResponse {
         return restTemplate.postForObject(
-            ACCESS_TOKEN_URL,
+            githubProperties.tokenUri,
             GithubAccessTokenRequest(
                 clientId = githubProperties.clientId,
                 clientSecret = githubProperties.clientSecret,