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
docker-alpine x86_64
distfiles-check

00:00:25

passed #157163
docker-alpine x86_64
lint

00:00:24

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