add: push changes to gitea server after merging local changes

This implementation has no configuration yet to authorize accordingly.
WIP for #3 and #4.

internal/gitea/milestone.go

@@ -3,6 +3,7 @@ package gitea
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
@@ -113,9 +114,10 @@ func (gitea *Gitea) GetMilestone(repo Repository, id uint) (Milestone, error) {
 	return milestone, nil
 }
 
+// FIXME: how to do basic authorization?
 func (gitea *Gitea) UpdateMilestone(repo Repository, milestone Milestone) error {
 	url := fmt.Sprintf("%s/repos/%s/milestones/%d", gitea.Url(), repo.Full_name, milestone.Id)
-	var payload map[string]interface{}
+	payload := make(map[string]interface{})
 	payload["description"] = milestone.Description
 	payload["due_on"] = milestone.Due_on
 	payload["state"] = milestone.State
@@ -124,10 +126,20 @@ func (gitea *Gitea) UpdateMilestone(repo Repository, milestone Milestone) error
 	if err != nil {
 		return err
 	}
-	_, err = http.NewRequest(http.MethodPatch, url, bytes.NewBuffer(json))
+	client := &http.Client{}
+	request, err := http.NewRequest(http.MethodPatch, url, bytes.NewBuffer(json))
+	request.Header.Set("content-type", "application/json")
 	if err != nil {
 		return err
 	}
+	result, err := client.Do(request)
+	if err != nil {
+		return err
+	}
+	defer result.Body.Close()
+	if result.StatusCode != 201 {
+		return errors.New(fmt.Sprintf("\tRequest returned status: %s\n", result.Status))
+	}
 	return nil
 }