[CI] Integration tests matrix pipeline resource (#4957)

* [CI] Integration tests matrix resource

* Added notification settings

catalog-info.yaml

@@ -194,6 +194,49 @@ spec:
           access_level: MANAGE_BUILD_AND_READ
         everyone:
           access_level: BUILD_AND_READ
+
+---
+# yaml-language-server: $schema=https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/rre.schema.json
+apiVersion: backstage.io/v1alpha1
+kind: Resource
+metadata:
+  name: buildkite-elastic-agent-integration-matrix
+  description: Elastic-agent integration tests matrix
+  links:
+    - title: Pipeline
+      url: https://buildkite.com/elastic/buildkite-elastic-agent-integration-matrix
+
+spec:
+  type: buildkite-pipeline
+  owner: group:ingest-fp
+  system: buildkite
+  implementation:
+    apiVersion: buildkite.elastic.dev/v1
+    kind: Pipeline
+    metadata:
+      name: buildkite-elastic-agent-integration-matrix
+      description: Runs elastic-agent integration tests for all supported platforms
+    spec:
+      pipeline_file: ".buildkite/pipeline.integration-test-matrix.yml"
+      provider_settings:
+        trigger_mode: none # don't trigger jobs from github activity
+      repository: elastic/elastic-agent
+      env:
+        ELASTIC_SLACK_NOTIFICATIONS_ENABLED: "true"
+        SLACK_NOTIFICATIONS_CHANNEL: "#ingest-notifications"
+        SLACK_NOTIFICATIONS_ON_SUCCESS: "false"
+        SLACK_NOTIFICATIONS_SKIP_FOR_RETRIES: "true"
+      schedules:
+        weekly:
+          branch: main
+          cronline: "0 0 * * 4" # every Thursday at 00:00
+          message: Integration test matrix
+      teams:
+        ingest-fp:
+          access_level: MANAGE_BUILD_AND_READ
+        everyone:
+          access_level: BUILD_AND_READ
+
 ---
 # yaml-language-server: $schema=https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/e57ee3bed7a6f73077a3f55a38e76e40ec87a7cf/rre.schema.json
 apiVersion: backstage.io/v1alpha1