Captain has built in docker image support for arm64 platform, even though it's not automatically generated from GitHub CI.
Replace the images in deploy.yaml before apply it:
# since v1.2.1
alaudapublic/captain:<version>-arm64
# cert-init image is removed since v1.3.0
alaudapublic/captain-cert-init:v1.0-arm64
alaudapublic/chartmuseum:v2.0-arm64