DST Root CA X3 expiration

Hi,
How to solve letsencrypt “DST Root CA X3” expiration on 30 sept 2021 on RancherOS machine ?
It’s now impossible to “docker pull” any image from a private registry backed by letsencrypt ssl, even after updating to “ISRG Root X1”:
docker --debug pull <DOMAIN>/image → “x509: certificate has expired or is not yet valid”

docker run --rm alpine/openssl s_client -servername <DOMAIN> -connect <DOMAIN>:443 gives:

CONNECTED(00000003)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = <DOMAIN>
verify return:1
DONE

docker run -v /etc/ssl:/etc/ssl --rm alpine/openssl s_client -servername -connect :443 gives:

CONNECTED(00000003)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = <DOMAIN>
verify return:1
DONE

One solution is to add this to the cloud-init yaml file and reboot the nodes:

write_files:
- path: /etc/ssl/certs/isrg-root-x1-cross-signed.crt
  permissions: "0644"
  owner: root
  content: |
    -----BEGIN CERTIFICATE----- 
    MIIFYDCCBEigAwIBAgIQQAF3ITfU6UK47naqPGQKtzANBgkqhkiG9w0BAQsFADA/
    MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
    DkRTVCBSb290IENBIFgzMB4XDTIxMDEyMDE5MTQwM1oXDTI0MDkzMDE4MTQwM1ow
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    Dfvp7OOGAN6dEOM4+qR9sdjoSYKEBpsr6GtPAQw4dy753ec5
    -----END CERTIFICATE-----
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