Automate openssl and llvm installations on macOS

[dougbu]

It's possible now #1540 is complete to automate more of DDFun's processes for imaging and re-imaging macOS machines. The remainder (as noted in #1540 (comment)) includes:

• openssl
• openssl@1.1
• llvm

The requirements here are a bit complicated, as noted in

1. brew install the additional packages
2. add openssl@1.1 and llvm bin folders to /etc/paths
3. create symbolic links for libcrypto.1.1.dylib and libssl.1.1.dylib in /usr/local/lib

The current DDFun instructions use version-specific paths such as /opt/homebrew/Cellar/openssl@1.1/1.1.1w and /usr/local/Cellar/openssl@1.1/1.1.1w though those should be available as symbolic links from within /opt/homebrew/opt. May want to use these symbolic links instead.

Release Note Category

• Feature changes/additions
• Bug fixes
• Internal Infrastructure Improvements

Release Note Description

Automated slightly more of the macOS on-prem machine setup, reducing requirements we place on the DDFun team.