fix AlmaLinux GPG key error (#3326)

This seems to fix the GPG key error posted at
#3325 (comment).
See https://almalinux.org/blog/2023-12-20-almalinux-8-key-update/

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
(cherry picked from commit d7a4f72)

pyproject.toml

@@ -218,6 +218,8 @@ environment-pass = [
 environment = { PIP_PREFER_BINARY="1", DP_LAMMPS_VERSION="stable_2Aug2023_update3", DP_ENABLE_IPI="1", MPI_HOME="/usr/lib64/mpich", PATH="/usr/lib64/mpich/bin:$PATH" }
 before-all = [
     """if [ ! -z "${DP_PKG_NAME}" ]; then sed -i "s/name = \\"deepmd-kit\\"/name = \\"${DP_PKG_NAME}\\"/g" pyproject.toml; fi""",
+    # https://almalinux.org/blog/2023-12-20-almalinux-8-key-update/
+    """rpm --import https://repo.almalinux.org/almalinux/RPM-GPG-KEY-AlmaLinux""",
     """{ if [ "$(uname -m)" = "x86_64" ] ; then yum config-manager --add-repo http://developer.download.nvidia.com/compute/cuda/repos/rhel8/x86_64/cuda-rhel8.repo && yum install -y cuda-nvcc-${CUDA_VERSION/./-} cuda-cudart-devel-${CUDA_VERSION/./-}; fi }""",
     "yum install -y mpich-devel",
 ]