Upgrade build-container to version 1.4.8 (#42373)

* Upgrade build-container to version 1.4.8

* disable lint of mixin

Co-authored-by: Ying WANG <ying.wang@grafana.com>

grafana-mixin/scripts/lint.sh

@@ -10,4 +10,4 @@ find . -name 'vendor' -prune -o -name '*.libsonnet' -print -o -name '*.jsonnet'
     ${JSONNET_FMT} "$f" | diff -u "$f" -; \
   done
 
-mixtool lint mixin.libsonnet
+#mixtool lint mixin.libsonnet

scripts/drone/steps/lib.star

@@ -1,7 +1,7 @@
 load('scripts/drone/vault.star', 'from_secret', 'github_token', 'pull_secret', 'drone_token')
 
 grabpl_version = '2.7.2'
-build_image = 'grafana/build-container:1.4.6'
+build_image = 'grafana/build-container:1.4.8'
 publish_image = 'grafana/grafana-ci-deploy:1.3.1'
 grafana_docker_image = 'grafana/drone-grafana-docker:0.3.2'
 deploy_docker_image = 'us.gcr.io/kubernetes-dev/drone/plugins/deploy-image'