Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

[mammarelm7]

When using apt 2.1.18 after doing apt --assume-yes upgrade, apt-key is deprecated and pointless.gpg is in an unsupported format to use in trusted.gpg.d

~ $ apt -v 
apt 2.1.18 (aarch64)

Output when using apt-key add which is used in https://its-pointless.github.io/setup-pointless-repo.sh

~ $  curl -sL https://its-pointless.github.io/pointless.gpg | apt-key add -
~ $  apt update
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

Output when trying to use key in trusted.gpg.d

~ $ curl -sL https://its-pointless.github.io/pointless.gpg > $PREFIX/etc/apt/trusted.gpg.d/pointless.gpg
~ $  apt update
https://its-pointless.github.io/files/24/dists/termux/InRelease: The key(s) in the keyring /data/data/com.termux/files/usr/etc/apt/trusted.gpg.d/pointless.gpg are ignored as the file has an unsupported filetype.

Output when looking at the filetype for pointless.gpg

~ $ file $PREFIX/etc/apt/trusted.gpg.d/pointless.gpg
/data/data/com.termux/files/usr/etc/apt/trusted.gpg.d/pointless.gpg: PGP public key block Public-Key (old)

Output when looking at the filetype of another key in the trusted.gpg.d which works

~ $ file $PREFIX/etc/apt/trusted.gpg.d/grimler.gpg
/data/data/com.termux/files/usr/etc/apt/trusted.gpg.d/grimler.gpg: PGP/GPG key public ring (v4) created Wed Jan  4 18:06:20 2017 RSA (Encrypt or Sign) 2048 bits MPI=0xa557bc8a1cdc9e66...

Can you provide an alternate pointless.gpg which will work with newer versions of apt?