fix: use shorter commit sha in version output (runatlantis#3163)

main.go

@@ -43,7 +43,12 @@ func main() {
 		panic(fmt.Sprintf("unable to initialize logger. %s", err.Error()))
 	}
 
-	atlantisVersion := fmt.Sprintf("%s (commit: %s) (build date: %s)", version, commit, date)
+	var sha = commit
+	if len(commit) >= 7 {
+		sha = commit[:7]
+	}
+
+	atlantisVersion := fmt.Sprintf("%s (commit: %s) (build date: %s)", version, sha, date)
 
 	// We're creating commands manually here rather than using init() functions
 	// (as recommended by cobra) because it makes testing easier.