Remove Hbc::Container::Gpg.

[reitermarkus]

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Given the discussion in #4120 and this not being used by any cask, let's just remove it.

[claui]

this not being used by any cask

Are you referring to the gpg stanza?

This is what I’ve found in homebrew-cask:

$ grep -R --include='*.rb' '^\s*gpg\s' Casks     # in homebrew-cask
Casks/litecoin.rb:  gpg "#{url}.asc", key_id: 'fe3348877809386c'
Casks/vlc.rb:  gpg "#{url}.asc", key_id: '65f7c6b4206bd057a7eb73787180713be58d1adc'
Casks/libreoffice.rb:  gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
Casks/espionage.rb:  gpg "#{url}.sig", key_url: 'https://www.taoeffect.com/other/A884B988.asc'
Casks/1password-cli.rb:  gpg 'op.sig', key_url: 'https://keybase.io/1password/pgp_keys.asc'
Casks/filebot.rb:  gpg "#{url}.asc", key_url: 'https://raw.githubusercontent.com/filebot/plugins/master/gpg/maintainer.pub'
Casks/keepassxc.rb:  gpg "#{url}.sig", key_url: 'https://keepassxc.org/keepassxc_master_signing_key.asc'
Casks/copay.rb:  gpg "#{url}.sig", key_id: '9d17e656bb3b6163ae9d71725cd600a61112cfa1'
Casks/lyx.rb:  gpg "#{url}.sig", key_id: 'de7a44fac7fb382d'
Casks/jameica.rb:  gpg "#{url}.asc", key_id: '5a8ed9cfc0db6c70'
Casks/pgadmin4.rb:  gpg "#{url}.sig", key_id: 'e0c4ceeb826b1fda4fb468e024adfaaf698f1519'
Casks/metasploit.rb:  gpg "#{url}.asc", key_id: '2007B954'
Casks/bisq.rb:  gpg "#{url}.asc", key_id: '1dc3c8c4316a698ac494039cf5b84436f379a1c6'
Casks/onionshare.rb:  gpg "#{url}.sig", key_url: 'https://onionshare.org/signing-key.asc'
Casks/ricochet.rb:  gpg "#{url}.asc", key_id: '9032cae4cbfa933a5a2145d5ff97c53f183c045d'
Casks/gpg-suite.rb:  gpg "#{url}.sig", key_url: 'https://gpgtools.org/GPGTools-00D026C4.asc'
Casks/mysqlworkbench.rb:  gpg "#{url}.asc", key_id: '8c718d3b5072e1f5'
Casks/mullvadvpn.rb:  gpg "#{url}.asc", key_id: 'a1198702fc3e0a09a9ae5b75d5a1d4f266de8ddf'
Casks/electrum.rb:  gpg "#{url}.asc", key_id: '6694d8de7be8ee5631bed9502bd5824b7f9470e6'
Casks/libreoffice-language-pack.rb:  gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
Casks/electrum-ltc.rb:  gpg "#{url}.asc", key_id: 'CAE1092AD3553FFD21C05DE36FC4C9F7F1BE8FEA'
Casks/bitpay.rb:  gpg "#{url}.sig", key_id: '9d17e656bb3b6163ae9d71725cd600a61112cfa1'
Casks/tunnelblick.rb:  gpg "#{url}.asc", key_id: '76df975a1c5642774fb09868ff5fd80e6bb9367e'
Casks/torbrowser.rb:  gpg "#{url}.asc", key_id: 'ef6e286dda85ea2a4ba7de684e2c6e8793298290'
Casks/borgbackup.rb:  gpg "#{url}.asc", key_id: '51F78E01'
Casks/mumble.rb:  gpg "#{url}.sig", key_url: 'https://github.com/mumble-voip/mumble-gpg-signatures/raw/master/mumble-auto-build-2017.asc'

And in homebrew-cask-versions:

$ grep -R --include='*.rb' '^\s*gpg\s' Casks
Casks/libreoffice-still.rb:  gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
Casks/gpg-suite-nightly.rb:  gpg "#{url}.sig", key_url: 'https://gpgtools.org/GPGTools-00D026C4.asc'
Casks/mullvad-vpn-beta.rb:  gpg "#{url}.asc", key_id: 'a1198702fc3e0a09a9ae5b75d5a1d4f266de8ddf'
Casks/pgadmin3.rb:  gpg "#{url}.sig", key_id: 'e0c4ceeb826b1fda4fb468e024adfaaf698f1519'
Casks/tor-browser-alpha.rb:  gpg "#{url}.asc", key_id: 'ef6e286dda85ea2a4ba7de684e2c6e8793298290'
Casks/libreoffice-rc.rb:  gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
Casks/libreofficedev.rb:  gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
Casks/multibit-classic.rb:  gpg "#{url}.asc", key_id: '23f7fb7b'
Casks/tunnelblick-beta.rb:  gpg "#{url}.asc", key_id: '76df975a1c5642774fb09868ff5fd80e6bb9367e'

[reitermarkus]

Are you referring to the gpg stanza?

No, this is the GPG container, which would be used to extract a GPG archive.