[Bug]: Unsupported mount diagnostic formats MountType with a string verb

[HNO3Miracle]

Testcontainers version

main at 33eefc1

Using the latest Testcontainers version?

Yes, checked the current main branch.

Host OS

Linux (WSL)

Host arch

amd64

Go version

go1.26.3 linux/amd64

Docker version

Not needed to reproduce this formatting defect; it is in the unsupported-mount diagnostic before any Docker operation.

Docker info

Not applicable to the diagnostic formatting.

What happened?

In mapToDockerMounts, the BindMounter branch prints m.Source.Type() with %s. MountType is a defined uint type with no String method, so a bind mount (type 0) produces a formatting error marker instead of the mount type.

Expected: a diagnostic containing the mount type without a fmt error marker. I would like to change this verb to %v and can submit a small fix. The affected mount tests pass with that change (go test -run 'Test.*Mount' ./). Opening this issue first as requested by the contribution guide.

Relevant log output

fmt.Sprintf("%s", testcontainers.MountTypeBind) produces %!s(testcontainers.MountType=0).

Additional information

This changes diagnostic formatting only, not which mounts are supported. The complete Docker integration suite has not been run.