Make openssl available in Docker environment
Make openssl available in Docker environment

Anvil Connect requires openssl to be present on the system in order to
generate keypairs.

alpine-sdk installs openssl, but it is deleted further on in the RUN
script when alpine-sdk is uninstalled.

Explicitly requesting the installation of the openssl package up front
prevents its removal when alpine-sdk is uninstalled.
anvilresearch/connect-cli,EternalDeiwos/connect-cli