selinux-tools build is failing

[EricEdens]

The build is failing with:

Step 4/10 : RUN bash /build_semodule_utils.sh
 ---> Running in f74689f7936f
Installing dependencies..
fetch http://dl-cdn.alpinelinux.org/alpine/edge/testing/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/19) Installing libcap-ng (0.7.10-r0)
(2/19) Installing audit-libs (2.8.5-r0)
(3/19) Installing libbz2 (1.0.8-r1)
(4/19) Installing fts (1.2.7-r1)
(5/19) Installing pcre (8.44-r0)
(6/19) Installing libselinux (2.8-r0)
(7/19) Installing libsepol (2.8-r0)
(8/19) Installing libsemanage (2.8-r0)
(9/19) Installing libpcre16 (8.44-r0)
(10/19) Installing libpcre32 (8.44-r0)
(11/19) Installing libgcc (9.3.0-r2)
(12/19) Installing libstdc++ (9.3.0-r2)
(13/19) Installing libpcrecpp (8.44-r0)
(14/19) Installing pkgconf (1.7.2-r0)
(15/19) Installing pcre-dev (8.44-r0)
(16/19) Installing bsd-compat-headers (0.7.2-r3)
(17/19) Installing libsepol-dev (2.8-r0)
(18/19) Installing libselinux-dev (2.8-r0)
(19/19) Installing libsemanage-dev (2.8-r0)
Executing busybox-1.31.1-r16.trigger
OK: 17 MiB in 37 packages
ERROR: unsatisfiable constraints:
  python (missing):
    required by: world[python]
The command '/bin/sh -c bash /build_semodule_utils.sh' returned a non-zero code: 1

Example: https://pantheon.corp.google.com/cloud-build/builds/dca33b8d-53d2-4b61-b07d-bd0a56cf723f;step=4?organizationId=433637338589&project=gcp-guest