build: add a new eui-release buildkite pipeline

.buildkite/pipelines/pipeline_release.yml

@@ -0,0 +1,7 @@
+steps:
+  - command: "echo 'This pipeline is currently a no-op'"
+    label: ':shrug: noop'
+    agents:
+      provider: gcp
+    # TODO: remove the test-automatic-releases condition when the pipeline is production-ready
+    if: build.branch == "main" || build.branch == "build/test-automatic-releases"

catalog-info.yaml

@@ -252,3 +252,47 @@ spec:
          access_level: MANAGE_BUILD_AND_READ
         everyone:
           access_level: READ_ONLY
+
+---
+##
+# buildkite-pipeline-eui-release
+# EUI Release - handle (pre)release process on merge to main
+##
+
+# yaml-language-server: $schema=https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/e57ee3bed7a6f73077a3f55a38e76e40ec87a7cf/rre.schema.json
+apiVersion: backstage.io/v1alpha1
+kind: Resource
+metadata:
+  name: buildkite-pipeline-eui-release
+  description: EUI pipeline to release the latest version of @elastic/eui
+  links: [
+    {
+      title: "EUI - release",
+      url: "https://buildkite.com/elastic/eui-release",
+    }
+  ]
+
+spec:
+  type: buildkite-pipeline
+  owner: group:eui-team
+  system: buildkite
+  implementation:
+    apiVersion: buildkite.elastic.dev/v1
+    kind: Pipeline
+    metadata:
+      name: eui-release
+    spec:
+      repository: elastic/eui
+      pipeline_file: ".buildkite/pipelines/pipeline_release.yml"
+      provider_settings:
+        build_branches: true
+        build_tags: false
+        build_pull_requests: false
+        filter_enabled: true
+        # TODO: remove the test-automatic-releases condition when the pipeline is production-ready
+        filter_condition: build.branch == "main" || build.branch == "build/test-automatic-releases"
+      teams:
+        eui-team:
+          access_level: MANAGE_BUILD_AND_READ
+        everyone:
+          access_level: READ_ONLY