Show bootstrap commit when asking to confirm

[emlun]

A minor help so the user can get a glimpse of what option is being proposed without having to copy-paste and cross-reference the commit hash manually.

Example, bark_rules bootstrap:

$ bark verify
commit f69ebbbcba4a2105e2459dde29022a21a7186c08 (bark_rules)
Author: Emil Lundberg <[email protected]>
Date:   Wed Jan 24 17:40:09 2024 +0100

    Initial commit

    There will be many others

    But this one is first

 .bark/bark_rules.yaml   |   7 ++
 .bark/commit_rules.yaml |   5 +
 .bark/pubkeys/dain      | 551 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 .bark/pubkeys/emil      | 852 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 .bark/requirements.txt  |   1 +
 .gitattributes          |   9 ++
 .gitignore              |  26 +++++
 7 files changed, 1451 insertions(+)
The bootstrap commit (f69ebbbcba4a2105e2459dde29022a21a7186c08) of the bark_rules branch has not been verified!
Do you want to trust this commit as the bootstrap for bark? [y/N]: y

Same for the per-branch bootstrap:

$ bark protect
Configure how the 'main' branch should be validated!

commit 186f962863dbc1ca73eca67540288d13f4b8170b (main)
Author: Emil Lundberg <[email protected]>
Date:   Wed Jan 24 17:39:39 2024 +0100

    Set up GitBark

 .bark/commit_rules.yaml |   4 +
 .bark/pubkeys/emil      | 852 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 856 insertions(+)
Do you want to verify the 'main' branch using commit 186f962863dbc1ca73eca67540288d13f4b8170b as bootstrap? [y/N]: