add parameters to pr bot org wide config (#2801)

Author: TrushynAliaksandr

.buildkite/pull-requests.org-wide.json

@@ -11,13 +11,16 @@
       ],
       "build_on_commit": true,
       "build_on_comment": true,
-      "trigger_comment_regex": "^(?:(?:buildkite\\W+)?(?:build|test)\\W+(?:this|it))",
-      "always_trigger_comment_regex": "^(?:(?:buildkite\\W+)?(?:build|test)\\W+(?:this|it))",
+      "trigger_comment_regex": "run docs-build ?(?<rebuild_opt>rebuild)? ?(?<warn_opt>warnlinkcheck)? ?(?<skip_opt>skiplinkcheck)?",
+      "always_trigger_comment_regex": "run docs-build ?(?<rebuild_opt>rebuild)? ?(?<warn_opt>warnlinkcheck)? ?(?<skip_opt>skiplinkcheck)?",
       "skip_ci_labels": [
         "skip-ci"
       ],
       "skip_ci_on_only_changed": [
-        "\\.md$"
+        ".*"
+      ],
+      "always_require_ci_on_changed": [
+        "docs\\.*"
       ],
       "repositories": [
         "elastic/docs",