Make caplock function like esc on console - nutthawit/alpine-dotfile GitHub Wiki
Configure the Caps Lock key to function as an additional Escape key.
apk add kbd kbd-doc
mkdir /etc/kbd
echo 'keycode 58 = Escape' | tee /etc/kbd/keymap
cat << EOF > /etc/local.d/keymap.start
#!/bin/sh
loadkeys /etc/kdb/keymap
EOF
chmod +x /etc/local.d/keymap.start
rc-update add local default
loadkeys /etc/kbd/keymap