gitlab-ci.yml: add distfile-check

Verify that each distfile has the same hash in all APKBUILDs.

Related: https://gitlab.com/postmarketOS/ci-common/-/blob/master/distfile-check/README.md
Status Job ID Name Coverage
  Lint
failed #157164
x86_64 docker-alpine
distfiles-check

00:00:25

passed #157163
x86_64 docker-alpine
lint

00:00:24

 
  Build
skipped #157169
aarch64 ci-build docker-alpine
build-aarch64
skipped #157170
armv7 ci-build docker-alpine
build-armv7
skipped #157168
ppc64le ci-build docker-alpine
build-ppc64le
skipped #157167
s390x ci-build docker-alpine
build-s390x
skipped #157166
x86 ci-build docker-alpine
build-x86
skipped #157165
x86_64 ci-build docker-alpine
build-x86_64
 
Name Stage Failure
failed
distfiles-check Lint
No job log