bug: `@openzeppelin/upgrades-core` not found

[erhant]

The tool https://github.com/OpenZeppelin/openzeppelin-foundry-upgrades uses an NPM package internally, and it is supposed to be installed automatically but for some reason it may not happen for certain users.

The fix is to simply install it manually:

npm install @openzeppelin/upgrades-core@latest -g

but this should not be required.

Related

• Error when runnning upgrade safety validation OpenZeppelin/openzeppelin-foundry-upgrades#85
• Failed to run upgrade safety validation OpenZeppelin/openzeppelin-foundry-upgrades#59

[erhant]

Using UnsafeUpgrade for tests help with this issue a bit, but for deployment / upgrades we need it nevertheless