ci/shellcheck: ignore SC3043 warnings about use of 'local'
This configures shellcheck in CI to ignore the use of the 'local'. Using 'local' to support variable scoping can prevent a lot of nasty bugs in shell scripts. Ash supports 'local', even though it's not a POSIX sh thing. It's used extensively in our init.sh script, and many Alpine scripts use it.
Edited by Administrator