Add BranchPushIndividually repo config

Instead of always pushing branches atomically (which can result in timeouts in larger and slower monorepos), add a BranchPushIndividually repo config setting which enables pushing each branch one at a time.

config/config.go

@@ -37,7 +37,8 @@ type RepoConfig struct {
 
 	ForceFetchTags bool `default:"false" yaml:"forceFetchTags"`
 
-	ShowPrTitlesInStack bool `default:"false" yaml:"showPrTitlesInStack"`
+	ShowPrTitlesInStack    bool `default:"false" yaml:"showPrTitlesInStack"`
+	BranchPushIndividually bool `default:"false" yaml:"branchPushIndividually"`
 }
 
 type UserConfig struct {

readme.md

@@ -167,6 +167,7 @@ User specific configuration is saved to .spr.yml in the user home directory.
 | forceFetchTags          | bool | false      | also fetch tags when running 'git spr update' |
 | branchNameIncludeTarget | bool | false      | include target branch name in pull request branch name |
 | showPrTitlesInStack     | bool | false      | show PR titles in stack description within pull request body |
+| branchPushIndividually  | bool | false      | push branches individually instead of atomically (only enable to avoid timeouts) |
 
 
 | User Config          | Type | Default | Description                                                     |

spr/spr.go

@@ -543,10 +543,18 @@ func (sd *stackediff) syncCommitStackToGitHub(ctx context.Context,
 		refNames = append(refNames,
 			commit.CommitHash+":refs/heads/"+branchName)
 	}
+
 	if len(updatedCommits) > 0 {
-		pushCommand := fmt.Sprintf("push --force --atomic %s ", sd.config.Repo.GitHubRemote)
-		pushCommand += strings.Join(refNames, " ")
-		sd.gitcmd.MustGit(pushCommand, nil)
+		if sd.config.Repo.BranchPushIndividually {
+			for _, refName := range refNames {
+				pushCommand := fmt.Sprintf("push --force %s %s", sd.config.Repo.GitHubRemote, refName)
+				sd.gitcmd.MustGit(pushCommand, nil)
+			}
+		} else {
+			pushCommand := fmt.Sprintf("push --force --atomic %s ", sd.config.Repo.GitHubRemote)
+			pushCommand += strings.Join(refNames, " ")
+			sd.gitcmd.MustGit(pushCommand, nil)
+		}
 	}
 	sd.profiletimer.Step("SyncCommitStack::PushBranches")
 	return true