add owner/org flag to backport, update readme

Signed-off-by: Brian Downs <[email protected]>

cmd/backport/README.md

@@ -8,16 +8,16 @@ If a commit is provided, `backport` assumes you're running from the repository t
 
 ```sh
 # Backport K3s change into release-1.21 and release-1.22. Only create the backport issues.
-./backport -r k3s -b 'release-1.21,release-1.22' -i 123
+./backport -o rancher -r k3s -b 'release-1.21,release-1.22' -i 123
 
 # Backport K3s change into release-1.21 and release-1.22. Creates the backport issues and cherry-picks the given commit id.
-./backport -r k3s -b 'release-1.21,release-1.22' -i 123 -c '181210f8f9c779c26da1d9b2075bde0127302ee0'
+./backport -o k3s-io -r k3s -b 'release-1.21,release-1.22' -i 123 -c '181210f8f9c779c26da1d9b2075bde0127302ee0'
 
 # Backport RKE2 change into release-1.20, release-1.21 and release-1.22
-./backport -r rke2 -b 'release-1.20,release-1.21,release-1.22' -i 456 -c 'cd700d9a444df8f03b8ce88cb90261ed1bc49f27'
+./backport -o rancher -r rke2 -b 'release-1.20,release-1.21,release-1.22' -i 456 -c 'cd700d9a444df8f03b8ce88cb90261ed1bc49f27'
 
 # Backport K3s change into release-1.21 and release-1.22 and assign to given user.
-./backport -r k3s -b 'release-1.21,release-1.22' -i 123 -u susejsmith
+./backport -o k3s-io -r k3s -b 'release-1.21,release-1.22' -i 123 -u susejsmith
 ```
 
 ## Contributions

cmd/backport/main.go

@@ -42,6 +42,7 @@ Note: if a commit is provided, %[2]s utility needs to be ran from either
 
 var (
 	vers      bool
+	owner     string
 	repo      string
 	commitIDs string
 	issueID   uint
@@ -62,6 +63,7 @@ func main() {
 	}
 
 	flag.BoolVar(&vers, "v", false, "")
+	flag.StringVar(&owner, "o", "", "")
 	flag.StringVar(&repo, "r", "", "")
 	flag.StringVar(&commitIDs, "c", "", "")
 	flag.UintVar(&issueID, "i", 0, "")
@@ -95,6 +97,7 @@ func main() {
 	client := repository.NewGithub(ctx, ghToken)
 
 	pbo := repository.PerformBackportOpts{
+		Owner:    owner,
 		Repo:     repo,
 		Commits:  commits,
 		IssueID:  issueID,