chore: add prefix to image errors

[knqyf263]

Description

Show more friendly errors from image sources.

Before

$ trivy image foo
...
2023-11-16T15:21:08.107+0900    FATAL   image scan error: scan error: unable to initialize a scanner: unable to initialize a docker scanner: 4 errors occurred:
        * unable to inspect the image (foo): Error response from daemon: No such image: foo:latest
        * containerd socket not found: /run/containerd/containerd.sock
        * unable to initialize Podman client: no podman socket found: stat podman/podman.sock: no such file or directory
        * GET https://index.docker.io/v2/library/foo/manifests/latest: UNAUTHORIZED: authentication required; [map[Action:pull Class: Name:library/foo Type:repository]]

After

$ trivy image foo
...
2023-11-16T15:19:48.658+0900    FATAL   image scan error: scan error: unable to initialize a scanner: unable to initialize a docker scanner: 4 errors occurred:
        * docker error: unable to inspect the image (foo): Error response from daemon: No such image: foo:latest
        * containerd error: containerd socket not found: /run/containerd/containerd.sock
        * podman error: unable to initialize Podman client: no podman socket found: stat podman/podman.sock: no such file or directory
        * remote error: GET https://index.docker.io/v2/library/foo/manifests/latest: UNAUTHORIZED: authentication required; [map[Action:pull Class: Name:library/foo Type:repository]]

Related issues

• Close Show more verbose error when scanning invalid image #5600

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

@AXDOOMER Does it help?

[knqyf263]

@DmitriyLewen I didn't see his response, but I believe it's useful anyway.

[DmitriyLewen]

image scan error: scan error: unable to initialize a scanner: unable to initialize a docker scanner: 4 errors occurred:

docker scanner can still be confusing.
What if you use an image scanner?

[knqyf263]

Good point. I was not aware of that. Thanks!
2e6b7bf

[DmitriyLewen]

LGTM