Install script signature verification fails in Alpine 3.20 container

[abstractionfactory]

When using the standalone installation method in an Alpine 3.20 container, the installation fails with:

/ # ./install-opentofu.sh --install-method standalone --install-path / --symlink-path -
OpenTofu Installer

Installing OpenTofu using the standalone installation method...
Determining latest OpenTofu version...
Downloading OpenTofu version 1.8.2...
Performing checksum verification...
Checksum for tofu_1.8.2_linux_amd64.zip is 3c0cf737e6b6a4520c26c5bbd90f6b432b9741dbc9214fd5eeb8b68606ac4915, as expected.
Performing signature verification...
Downloading signature file...
Downloading GPG key...
Dearmoring GPG key...
Verifying GPG key fingerprint...
gpg: directory '/root/.gnupg' created
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: Signature made Wed Sep  4 18:32:13 2024 UTC
gpg:                using RSA key E3E6E43D84CB852EADB0051D0C0AF313E5FD9F80
gpg: Can't check signature: No public key
Signature verification failed.

The GPG version in this container is 2.4.5 and the GPG key verification doesn't seem to work as indicated by listing keys returning with an empty output:

gpg --no-default-keyring --keyring /tmp/tmp.goCibg/opentofu.asc.gpg --list-keys

Related to opentofu/opentofu#1931