A recent update on edge caused the meson package to be missing the meson binary. This was not intended, and causes issues when building packages which uses the meson build system:
/usr/bin/abuild-meson: exec: line 5: meson: not found
An issue was created upstream to fix the meson package: https://gitlab.alpinelinux.org/alpine/aports/-/issues/12596
When a fix is applied upstream, the meson binary will be available again when building packages with pmbootstrap.
EDIT: Fix is applied upstream https://gitlab.alpinelinux.org/alpine/aports/-/commit/9baa2eae7bb9377b3df5b8b879befeccb2e601ed and the meson binary is available again.