How to install software

[AndyM]

I think that perhaps I need to add some more repositories in order to install some more software. For example:

lingot
pysolfc

for lingot I simply get

$ sudo apk add lingot
[sudo] password for user:
fetch http://mirror.postmarketos.org/postmarke...DEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3....DEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3....DEX.tar.gz
ERROR: unable to select packages:
  lingot (no such package):
    required by: world[lingot]

If I try:
$ sudo apk search -v -d pysol
I get
py3-pysol-cards-0.10.1-r0 - Deal PySol FC Cards

$ sudo apk add (any one of:
for pysol, pysolfc, py3-pysol) I get the same result

I have not used alpine before, so I am learning ... slowly

Thanks

Andrew