Add GitHub actions for testing VOL connectors (#3849)

* Fix issue with HDF5_VOL_ALLOW_EXTERNAL CMake variable

* Add initial API test workflow

* Initialize parallel testing with MPI_THREAD_MULTIPLE when testing API

* Add CMake variable to allow specifying a VOL connector's package name

* Remove call to MPI_Init in serial API tests

While previously necessary, it now interferes with VOL connectors that
may need to be initialized with MPI_THREAD_MULTIPLE

1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 45d6bed..28a7727 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ HDF5 version 1.15.0 currently under development
 [![netCDF build status](https://img.shields.io/github/actions/workflow/status/HDFGroup/hdf5/netcdf.yml?branch=develop&label=netCDF)](https://github.com/HDFGroup/hdf5/actions/workflows/netcdf.yml?query=branch%3Adevelop)
 [![h5py build status](https://img.shields.io/github/actions/workflow/status/HDFGroup/hdf5/h5py.yml?branch=develop&label=h5py)](https://github.com/HDFGroup/hdf5/actions/workflows/h5py.yml?query=branch%3Adevelop)
 [![CVE regression](https://img.shields.io/github/actions/workflow/status/HDFGroup/hdf5/cve.yml?branch=develop&label=CVE)](https://github.com/HDFGroup/hdf5/actions/workflows/cve.yml?query=branch%3Adevelop)
+[![HDF5 VOL connectors build status](https://img.shields.io/github/actions/workflow/status/HDFGroup/hdf5/vol.yml?branch=develop&label=HDF5-VOL)](https://github.com/HDFGroup/hdf5/actions/workflows/vol.yml?query=branch%3Adevelop)
 [![1.14 build status](https://img.shields.io/github/actions/workflow/status/HDFGroup/hdf5/main.yml?branch=hdf5_1_14&label=1.14)](https://github.com/HDFGroup/hdf5/actions/workflows/main.yml?query=branch%3Ahdf5_1_14)
 [![BSD](https://img.shields.io/badge/License-BSD-blue.svg)](https://github.com/HDFGroup/hdf5/blob/develop/COPYING)