[buildkite] Move periodic pipeline schedule to a separate trigger job, and add the other branches (#98068)

.buildkite/pipelines/periodic.trigger.yml

@@ -0,0 +1,16 @@
+steps:
+  - trigger: elasticsearch-periodic
+    label: Trigger periodic pipeline for main
+    async: true
+    build:
+      branch: main
+  - trigger: elasticsearch-periodic
+    label: Trigger periodic pipeline for 8.9
+    async: true
+    build:
+      branch: "8.9"
+  - trigger: elasticsearch-periodic
+    label: Trigger periodic pipeline for 7.17
+    async: true
+    build:
+      branch: "7.17"

catalog-info.yaml

@@ -92,7 +92,41 @@ spec:
         elasticsearch-team: {}
         ml-core: {}
         everyone:
-          access_level: READ_ONLY
+          access_level: BUILD_AND_READ
+      provider_settings:
+        build_branches: false
+        build_pull_requests: false
+        publish_commit_status: false
+        trigger_mode: none
+---
+# 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-elasticsearch-periodic-trigger
+  description: Triggers periodic pipeline for all required branches
+  links:
+    - title: Pipeline
+      url: https://buildkite.com/elastic/elasticsearch-periodic-trigger
+spec:
+  type: buildkite-pipeline
+  system: buildkite
+  owner: group:elasticsearch-team
+  implementation:
+    apiVersion: buildkite.elastic.dev/v1
+    kind: Pipeline
+    metadata:
+      description: ":elasticsearch: Triggers periodic pipeline for all required branches"
+      name: elasticsearch / periodic / trigger
+    spec:
+      repository: elastic/elasticsearch
+      pipeline_file: .buildkite/pipelines/periodic.trigger.yml
+      branch_configuration: main
+      teams:
+        elasticsearch-team: {}
+        ml-core: {}
+        everyone:
+          access_level: BUILD_AND_READ
       provider_settings:
         build_branches: false
         build_pull_requests: false
@@ -102,4 +136,4 @@ spec:
         Periodically on main:
           branch: main
           cronline: "0 0,8,16 * * * America/New_York"
-          message: "Tests and checks that are run 3x daily"
+          message: "Triggers pipelines 3x daily"