Merge branch 'zimniy-master-patch-40657' into 'master'

Update Dockerfile

See merge request tools/docker/shellcheck-ci!2

Dockerfile

-ARG DOCKER_REGISTRY=registry.cyberbrain.pw
-FROM $DOCKER_REGISTRY/tools/docker/shellcheck:latest AS runtime
+FROM koalaman/shellcheck-alpine:latest AS runtime
 COPY entrypoint.sh /entrypoint.sh
 RUN set -ex && \
     chmod a+x /entrypoint.sh