Add build status badge

Author: anwai98

README.md

@@ -1,8 +1,9 @@
 # bioimage-cpp
 
+[![Documentation](https://img.shields.io/badge/docs-pdoc-blue)](https://computational-cell-analytics.github.io/bioimage-cpp/)
+[![Build Status](https://github.com/computational-cell-analytics/bioimage-cpp/actions/workflows/tests.yml/badge.svg)](https://github.com/computational-cell-analytics/bioimage-cpp/actions/workflows/tests.yml)
 [![PyPI](https://img.shields.io/pypi/v/bioimage-cpp)](https://pypi.org/project/bioimage-cpp/)
 [![conda-forge](https://img.shields.io/conda/vn/conda-forge/bioimage-cpp)](https://anaconda.org/conda-forge/bioimage-cpp)
-[![Documentation](https://img.shields.io/badge/docs-pdoc-blue)](https://computational-cell-analytics.github.io/bioimage-cpp/)
 
 Image processing and segmentation functionality in C++ with light-weight python bindings through nanobind and minimal dependencies to enable distribution via pip.