Try this

Author: lildude

script/codespaces-post-start

@@ -25,4 +25,8 @@ if [ ! -f "${HOME}/.ssh/git_signing_ed25519" ]; then
   # Takes this from my Codespaces secrets config on GitHub
   echo "$GIT_SIGNING_KEY" > "${HOME}/.ssh/git_signing_ed25519"
   chmod 600 "${HOME}/.ssh/git_signing_ed25519"
-fi
+fi
+
+# Unset these as GitHub doesn't verify commits by the default GitHub <[email protected]> set by default in Codespaces
+unset GIT_COMMITTER_EMAIL
+unset GIT_COMMITTER_NAME