[thaJeztah]

• fixes dockerd fails to fully start with containerd snapshotter and many builds/images: context deadline exceeded #48569

Use view transaction for metadata read to prevent dockerd failing to fully start with a "context deadline exceeded error" with containerd snapshotter and many builds/images.

full diff: moby/buildkit@v0.17.2...80e01a9

- What I did

- How I did it

- How to verify it

- Description for the changelog

containerd image store: Fix dockerd failing to fully start with a "context deadline exceeded error" with containerd snapshotter and many builds/images.

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

Failure is unrelated and may be addressed by #48940

=== FAIL: amd64.integration.build TestBuildUserNamespaceValidateCapabilitiesAreV2 (9.58s)
Loaded image: busybox:latest
Loaded image: busybox:glibc
Loaded image: debian:bookworm-slim
Loaded image: hello-world:latest
Loaded image: arm32v7/hello-world:latest
    build_userns_linux_test.go:131: run produced invalid output: "", expected "/bin/sleep cap_net_bind_service=eip"