https://github.com/ethereum-optimism/optimism/pull/1033#issuecomment-866146467

Removed unused functions from core utils

docker: pin to alpine 3.13 for l2geth

fix: update statement for skipping codechecks

A bug has appeared when older versions of Docker are used to build
alpine based images in alpine version 3.14. To prevent this problem
from happening to the users, this PR pins the version to 3.13.

The observed problem is that `make` cannot run any command and
the error message states `Operation not permitted.` Removing
`make` was one way to solve the problem but that would increase
the diff from upstream geth.

See these links for details:
https://github.com/alpinelinux/docker-alpine/issues/182
https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0

github actions: bump geth CI golang version

fix: skip codechecks for PRs from external repos

and fix a solidity linting error

compliant with the standard bridge