tests: better simulate BCR environment (#3706)

Better simulate the BCR environment by removing files that aren't
extracted when BCR extracts the release archive.

Author: rickeylev

.bazelci/isolate.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+module_dir="${1:-}"
+
+if [[ -z "${module_dir}" ]]; then
+  echo "Usage: $0 <module_directory>"
+  exit 1
+fi
+
+# Find the repository root assuming this script is in .bazelci/
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(dirname "${script_dir}")"
+
+cd "${repo_root}"
+
+if [[ ! -f "MODULE.bazel" ]]; then
+  echo "Error: MODULE.bazel not found in ${repo_root}. Are you sure this is the repo root?"
+  exit 1
+fi
+
+if [[ ! -d "${module_dir}" ]]; then
+  echo "Error: Module directory '${module_dir}' not found in ${repo_root}."
+  exit 1
+fi
+
+echo "Removing files outside of ${module_dir} to simulate BCR environment..."
+find . -maxdepth 1 -mindepth 1 \
+  ! -name "${module_dir}" \
+  ! -name ".git" \
+  ! -name ".bazelci" \
+  -exec rm -rf '{}' +

.bazelci/presubmit.yml

@@ -180,6 +180,8 @@ tasks:
     name: "Sphinxdocs: Ubuntu"
     working_directory: "sphinxdocs"
     platform: ubuntu2204
+    shell_commands:
+      - "../.bazelci/isolate.sh sphinxdocs"
     build_targets:
       - "//..."
     test_targets:
@@ -188,6 +190,8 @@ tasks:
     name: "Sphinxdocs: Mac"
     working_directory: "sphinxdocs"
     platform: macos_arm64
+    shell_commands:
+      - "../.bazelci/isolate.sh sphinxdocs"
     build_targets:
       - "//..."
     test_targets: