enable indexer using `compose.indexer.yml` on self-host:
```bash
docker compose -f compose.yml -f compose.indexer.yml up
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Chores**
- Updated the build process in the development container to include building the reader package.
- Added and configured a Manticore Search indexer service in the development container.
- Removed the indexer service and related environment variables from the self-hosted Docker Compose setup and environment example file.
- **Documentation**
- Improved documentation formatting for better readability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Chores**
- Added a `.gitignore` file to prevent the `.env` file in the self-hosted Docker directory from being tracked by Git.
- **New Features**
- Introduced a new environment variable for the search endpoint in the Docker Compose configuration for improved service connectivity.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Chores**
- Updated the Docker Compose configuration to use a different image for the Postgres service.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
close CLOUD-137
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced advanced workspace-scoped search and aggregation capabilities with support for complex queries, highlights, and pagination.
- Added pluggable search providers: Elasticsearch and Manticoresearch.
- New GraphQL queries, schema types, and resolver support for search and aggregation.
- Enhanced configuration options for search providers in self-hosted and cloud deployments.
- Added Docker Compose services and environment variables for Elasticsearch and Manticoresearch.
- Integrated indexer service into deployment and CI workflows.
- **Bug Fixes**
- Improved error handling with new user-friendly error messages for search provider and indexer issues.
- **Documentation**
- Updated configuration examples and environment variable references for indexer and search providers.
- **Tests**
- Added extensive end-to-end and provider-specific tests covering indexing, searching, aggregation, deletion, and error cases.
- Included snapshot tests and test fixtures for search providers.
- **Chores**
- Updated deployment scripts, Helm charts, and Kubernetes manifests to include indexer-related environment variables and secrets.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
