contrib: remove builder keys

This has been superseded by adding a builder-keys/ directory in
guix.sigs, where the presence of keys, and validity of signatures
is checked. Preventing issues like missing keys or invalid signatures.

New (or exisiting) Guix builders can add their key in the next PR
they open adding attestations.

Author: fanquake

contrib/README.md

@@ -26,9 +26,6 @@ The [Debian](/contrib/debian) subfolder contains the copyright file.
 
 All other packaging related files can be found in the [bitcoin-core/packaging](https://github.com/bitcoin-core/packaging) repository.
 
-### [Builder keys](/contrib/builder-keys)
-PGP keys used for signing Bitcoin Core [release](/doc/release-process.md) results.
-
 ### [MacDeploy](/contrib/macdeploy) ###
 Scripts and notes for Mac builds.
 

contrib/builder-keys/README.md

@@ -134,7 +134,6 @@ Follow the relevant Guix README.md sections:
 
 ### Verify other builders' signatures to your own (optional)
 
-- [Add other builders keys to your gpg keyring, and/or refresh keys](/contrib/builder-keys/README.md)
 - [Verifying build output attestations](/contrib/guix/README.md#verifying-build-output-attestations)
 
 ### Commit your non codesigned signature to guix.sigs
@@ -193,7 +192,6 @@ popd
 
 ### Verify other builders' signatures to your own (optional)
 
-- [Add other builders keys to your gpg keyring, and/or refresh keys](/contrib/builder-keys/README.md)
 - [Verifying build output attestations](/contrib/guix/README.md#verifying-build-output-attestations)
 
 ### Commit your codesigned signature to guix.sigs (for the signed macOS/Windows binaries)

contrib/builder-keys/keys.txt

@@ -12,7 +12,7 @@
 from subprocess import check_output, STDOUT, CalledProcessError
 
 IGNORE_WORDS_FILE = 'test/lint/spelling.ignore-words.txt'
-FILES_ARGS = ['git', 'ls-files', '--', ":(exclude)build-aux/m4/", ":(exclude)contrib/seeds/*.txt", ":(exclude)depends/", ":(exclude)doc/release-notes/", ":(exclude)src/leveldb/", ":(exclude)src/crc32c/", ":(exclude)src/qt/locale/", ":(exclude)src/qt/*.qrc", ":(exclude)src/secp256k1/", ":(exclude)src/minisketch/", ":(exclude)contrib/builder-keys/keys.txt", ":(exclude)contrib/guix/patches"]
+FILES_ARGS = ['git', 'ls-files', '--', ":(exclude)build-aux/m4/", ":(exclude)contrib/seeds/*.txt", ":(exclude)depends/", ":(exclude)doc/release-notes/", ":(exclude)src/leveldb/", ":(exclude)src/crc32c/", ":(exclude)src/qt/locale/", ":(exclude)src/qt/*.qrc", ":(exclude)src/secp256k1/", ":(exclude)src/minisketch/", ":(exclude)contrib/guix/patches"]
 
 
 def check_codespell_install():