If you want to add many secrets at once, you can use this tool.
Also, if you want, delete them.
Token
You need to define TOKEN env-var with your GitHub token.
List all secrets
./actions-secrets -owner <your-namespace> -repo <your-repository> -list-all
List secrets defined in file
./actions-secrets -owner <your-namespace> -repo <your-repository> -list <env-file>
Apply secrets
./actions-secrets -owner <your-namespace> -repo <your-repository> -apply <env-file>
Delete secrets
./actions-secrets -owner <your-namespace> -repo <your-repository> -delete <env-file>
Other options
-override with -apply overrides env-var (otherwise we only check if it exists)
-verbose a little bit more informations