add a build flag "containers_image_openpgp"

[24sama]

What type of PR is this?

/kind dependencies

What this PR does / why we need it:

containers_image_openpgp: Use a Golang-only OpenPGP implementation for signature verification instead of the default cgo/gpgme-based implementation; the primary downside is that creating new signatures with the Golang-only implementation is not supported.

Add a build flag "containers_image_openpgp" to prevent dependency on gpgme.
This PR is used to support importing the github.com/containers/image/v5 package in KubeKey later.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

Additional documentation, usage docs, etc.:

[ks-ci-bot]

@24sama: The label(s) kind/dependencies cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind dependencies

What this PR does / why we need it:

containers_image_openpgp: Use a Golang-only OpenPGP implementation for signature verification instead of the default cgo/gpgme-based implementation; the primary downside is that creating new signatures with the Golang-only implementation is not supported.

Add a build flag "containers_image_openpgp" to prevent dependency on gpgme.
This PR is used to support importing the github.com/containers/image/v5 package in KubeKey later.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

Additional documentation, usage docs, etc.:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 24sama

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[24sama]

/dependencies

[24sama]

/cc @pixiake

[pixiake]

/lgtm

[ks-ci-bot]

LGTM label has been added.

Git tree hash: 697aa6d2cd04d441a539b4ac776ba7fd5bc1119e