fix(bitbucketcloud): Ensure status key has at most 40 characters (run…

…atlantis#2037)

* fix(bitbucketcloud): Ensure status key has at most 40 characters

* Use fmt.Sprintf()

server/events/vcs/bitbucketcloud/client.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"unicode/utf8"
 
 	"github.com/pkg/errors"
 	"github.com/runatlantis/atlantis/server/events/models"
@@ -179,6 +180,11 @@ func (b *Client) UpdateStatus(repo models.Repo, pull models.PullRequest, status
 		url = b.AtlantisURL
 	}
 
+	// Ensure key has at most 40 characters
+	if utf8.RuneCountInString(src) > 40 {
+		src = fmt.Sprintf("%.37s...", src)
+	}
+
 	bodyBytes, err := json.Marshal(map[string]string{
 		"key":         src,
 		"url":         url,