fix issue with sha gob encoding/decoding (#1149)

git/sha/sha.go

@@ -15,7 +15,10 @@
 package sha
 
 import (
+ "bytes"
+ "encoding/gob"
  "encoding/json"
+ "fmt"
  "regexp"
  "strings"
 
@@ -51,6 +54,22 @@ func New(value string) (SHA, error) {
  }, nil
 }
 
+func (s SHA) GobEncode() ([]byte, error) {
+ buffer := &bytes.Buffer{}
+ err := gob.NewEncoder(buffer).Encode(s.str)
+ if err != nil {
+ return nil, fmt.Errorf("failed to pack sha value: %w", err)
+ }
+ return buffer.Bytes(), nil
+}
+
+func (s *SHA) GobDecode(v []byte) error {
+ if err := gob.NewDecoder(bytes.NewReader(v)).Decode(&s.str); err != nil {
+ return fmt.Errorf("failed to unpack sha value: %w", err)
+ }
+ return nil
+}
+
 func (s *SHA) UnmarshalJSON(content []byte) error {
  if s == nil {
  return nil