Issue

When running the package you get a message like this

"powershell-7.0.0-preview.5-osx-x64.pkg" can't be opened because Apple cannot check it for malicious software.

Workaround - Finder

1. Click Ok in the dialog.
2. Find the package in Finder.
3. Control Click (click while holding the ctrt key) on the package icon.
4. Click open on the context menu that comes up.
   

Workaround - Command Line

1. run sudo xattr -rd com.apple.quarantine <path to package>, replace <path to package> with the actual path to the .pkg file.
2. Then install the package as you normally would.

Required changes

1.       Opt-in to use runtime hardening when developing your app.
a.       Insert the following key by editing your info.plist: CSFlags of type int, 65536 is the hardening value
                <key>CSFlags>
                <integer>65536</integer>
                                       i.            Create entitlements file
                                     ii.            Pass a directive to codesign with entitlements file
Same entitlements file and syntax are used for both hardening and sandboxing but they are orthogonal to each other.