I can point you at the various fixes for things I've reported since this first became available, but given your skepticism I'm sure it would not help since he seems to exclusively use the changeset description: "[add] various fixes" with no attribution.
Some folks solve this by adding glibc to Alpine (IIUC this is what Envoy is building upon).
It has a package manager, but it is far from as comprehensive. The security database is still essentially an experiment with much less richness than Ubuntu, Debian, Redhat, ...
If what you want is a package manager, you probably want minideb from the Bitnami folks.
In the talk, I call this "FROM scratch -- for the rest of us."
That a half-truth because this also tries to set up a minimal compatible environment for common cases, e.g. it sets up ca-certs, a /tmp directory, and an /etc/passwd file.
I can point you at the various fixes for things I've reported since this first became available, but given your skepticism I'm sure it would not help since he seems to exclusively use the changeset description: "[add] various fixes" with no attribution.
Here's the link for that last bit: https://git.alpinelinux.org/cgit/alpine-secdb/log/
¯\_(ツ)_/¯