chore: avoid work on non master branches (#53)

Author: Eun

pkg/merge-with-label/server/base_request.go

@@ -16,7 +16,8 @@ type BaseRequest struct {
 		Owner    struct {
 			Login string `json:"login"`
 		} `json:"owner"`
-		Private bool `json:"private"`
+		Private       bool   `json:"private"`
+		DefaultBranch string `json:"default_branch"`
 	} `json:"repository"`
 }
 

pkg/merge-with-label/server/server.go

@@ -328,7 +328,8 @@ func (h *Handler) handlePullRequestReview(logger *zerolog.Logger, eventID string
 func (h *Handler) handlePush(logger *zerolog.Logger, eventID string, body []byte, w http.ResponseWriter) {
 	var req struct {
 		BaseRequest
-		Deleted bool `json:"deleted"`
+		Deleted bool   `json:"deleted"`
+		Ref     string `json:"ref"`
 	}
 
 	if err := json.Unmarshal(body, &req); err != nil {
@@ -343,6 +344,14 @@ func (h *Handler) handlePush(logger *zerolog.Logger, eventID string, body []byte
 		return
 	}
 
+	if req.Ref != "refs/heads/"+req.Repository.DefaultBranch {
+		// no need to handle pushes that are not targeted to the master branch.
+		// pushes to branches will only be handled when there is a pull request open
+		// and if a pull request is open, github will call the pull_request synchronize event.
+		h.respond(w, http.StatusOK, "ok")
+		return
+	}
+
 	err := common.QueueMessage(
 		logger,
 		h.JetStreamContext,