openssl x509 -in certificate.pem -outform der -out certificate.der
security unlock-keychain -p "your_password" ~/Library/Keychains/login.keychain
security import certificate.der -k ~/Library/Keychains/login.keychain -T /usr/bin/codesign -x -A -t "legacy"
security add-trusted-cert -k ~/Library/Keychains/login.keychain certificate.der
security lock-keychain ~/Library/Keychains/login.keychain