[ServiceBus] Add packages needed for installation on alpine to README

[seankane-msft]

Add a line to the README with installation instructions for alpine on linux similar to cryptography

On docker I was able to confirm installation after adding these packages:

apk add --update python3 py-pip cmake python3-dev clang clang-dev openssl-dev gcc g++ libc-dev linux-headers

[yunhaoling]

hey @seankane-msft , thanks for the breadcrumb!

is this to solve the issue: #13796?

[seankane-msft]

hey @seankane-msft , thanks for the breadcrumb!

is this to solve the issue: #13796?

yes!

[yunhaoling]

@seankane-msft , I found the minimal dependency set could be:
apk add --update python3 py-pip python3-dev cmake gcc g++ openssl-dev build-base,
which is a subset of yours except for the build-base dependency.

If I didn't install build-base, my local building of uamqp wheel would fail.