Use platform qualifier in build command

Relates elastic/elasticsearch#37881

Author: danielmitterdorfer

cars/v1/default_distro/config.ini

@@ -1,5 +1,5 @@
 [variables]
-build_command=./gradlew :distribution:archives:tar:assemble
-artifact_path_pattern=distribution/archives/tar/build/distributions/*.tar.gz
+build_command=./gradlew :distribution:archives:linux-tar:assemble
+artifact_path_pattern=distribution/archives/linux-tar/build/distributions/*.tar.gz
 release_url=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-{{VERSION}}.tar.gz
-docker_image=docker.elastic.co/elasticsearch/elasticsearch
+docker_image=docker.elastic.co/elasticsearch/elasticsearch

cars/v1/vanilla/config.ini

@@ -1,7 +1,7 @@
 [variables]
 clean_command = ./gradlew clean
-build_command = ./gradlew :distribution:archives:oss-tar:assemble
-artifact_path_pattern = distribution/archives/oss-tar/build/distributions/*.tar.gz
+build_command = ./gradlew :distribution:archives:oss-linux-tar:assemble
+artifact_path_pattern = distribution/archives/oss-linux-tar/build/distributions/*.tar.gz
 release_url = https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-{{VERSION}}.tar.gz
 docker_image=docker.elastic.co/elasticsearch/elasticsearch-oss
 # major version of the JDK that is used to build Elasticsearch