[ci] Adds Github label to build all platforms (elastic#115134)

Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

.buildkite/scripts/build_kibana.sh

@@ -5,7 +5,11 @@ set -euo pipefail
 export KBN_NP_PLUGINS_BUILT=true
 
 echo "--- Build Kibana Distribution"
-node scripts/build --debug
+if [[ "${GITHUB_PR_LABELS:-}" == *"ci:build-all-platforms"* ]]; then
+  node scripts/build --all-platforms --skip-os-packages
+else
+  node scripts/build
+fi
 
 echo "--- Archive Kibana Distribution"
 linuxBuild="$(find "$KIBANA_DIR/target" -name 'kibana-*-linux-x86_64.tar.gz')"

.buildkite/scripts/post_build_kibana.sh

@@ -12,7 +12,6 @@ fi
 echo "--- Upload Build Artifacts"
 # Moving to `target/` first will keep `buildkite-agent` from including directories in the artifact name
 cd "$KIBANA_DIR/target"
-mv kibana-*-linux-x86_64.tar.gz kibana-default.tar.gz
-buildkite-agent artifact upload kibana-default.tar.gz
-buildkite-agent artifact upload kibana-default-plugins.tar.gz
+cp kibana-*-linux-x86_64.tar.gz kibana-default.tar.gz
+buildkite-agent artifact upload "./*.tar.gz;./*.zip"
 cd -