Install rasa on aarch64

@nik202 Thank you for your help. Unfortunately I came to the conclusion that tensorflow and rasa 2.5 cannot be installed on orange pi. I also tried compiling both tensorflow and rasa and it never works. Too many errors are thrown during compilation. Using raspberry, there are no problems.

@tboprob I know, but still we are trying. Hope Rasa Team will help more on this. Good Luck for your project.

@nik202 I thank you. i wanted to test rasa on an orange pi instead of using external flask or ws.