Do not trigger tests if only docs were modified (#9240) (#9257)

ci/maybe-trigger-tests.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -e
+cd "$(dirname "$0")/.."
+
+annotate() {
+  ${BUILDKITE:-false} && {
+    buildkite-agent annotate "$@"
+  }
+}
+
+# Skip if only the docs have been modified
+ci/affects-files.sh \
+  \!^docs/ \
+|| {
+  annotate --style info \
+    "Skipping all further tests as only docs/ files were modified"
+  exit 0
+}
+
+annotate --style info "Triggering tests"
+buildkite-agent pipeline upload ci/buildkite-tests.yml