Get "failed to create resource: Secret in version "v1" cannot be handled as a Secret: json: cannot unmarshal number into Go struct field Secret.stringData of type string" when password contains only digits

On a cpam3 deployment, I got the following error:

$ kubectl describe hr cluster-bmh
Name:         cluster-bmh
Namespace:    sylva-system
[...]
Status:
  Conditions:
    Last Transition Time:  2025-02-03T15:57:55Z
    Message:               Failed to upgrade after 3 attempt(s)
    Observed Generation:   1
    Reason:                RetriesExceeded
    Status:                True
    Type:                  Stalled
    Last Transition Time:  2025-02-03T15:57:55Z
    Message:               Helm upgrade failed for release sylva-system/cluster-bmh with chart sylva-capi-cluster@0.4.4: failed to create resource: Secret in version "v1" cannot be handled as a Secret: json: cannot unmarshal number into Go struct field Secret.stringData of type string
    Observed Generation:   1
    Reason:                UpgradeFailed
    Status:                False
    Type:                  Ready
    Last Transition Time:  2025-02-03T15:55:18Z
    Message:               Helm upgrade failed for release sylva-system/cluster-bmh with chart sylva-capi-cluster@0.4.4: failed to create resource: Secret in version "v1" cannot be handled as a Secret: json: cannot unmarshal number into Go struct field Secret.stringData of type string
    Observed Generation:   1
    Reason:                UpgradeFailed
    Status:                False
    Type:                  Released
  Failures:                4
  Helm Chart:              sylva-system/sylva-system-cluster-bmh
[...]

The root cause of the error is the fact that bmh password was only made with digits and copied in secret as a number instead of a string

Workaround

• change password

or

• add additional quotes around password

baremetal_hosts:
  server1:
    credentials:
      password: '"123456789"'
      username: my-user

Note: the second workaround would break with proposed fix in sylva-projects/sylva-elements/helm-charts/sylva-capi-cluster!577 (merged) as inner quotes would be included in password