It's generally not a good idea to attach your resume to a cold email. Cold emails should be brief and focused on introducing yourself and explaining the purpose of your email. Attaching a resume can make the email unnecessarily long and may not be relevant to the recipient.
If you want to include information about your background and qualifications, it's generally better to include a summary of your relevant experience and skills in the body of the email. This can help you introduce yourself and your qualifications without overwhelming the recipient with too much information.
If the recipient is interested in learning more about your background and qualifications, they can ask for a copy of your resume or request more information. In this case, you can attach a copy of your resume or provide more detailed information about your experience and skills.
Keep your cold email brief and focused on introducing yourself and explaining the purpose of your email, rather than attaching a copy of your resume.