CI: Enable PEXSI in GNU workflows

Author: Growl1234

.github/workflows/build_test_cmake.yml

@@ -24,7 +24,7 @@ jobs:
 
           - tag: gnu
             external_toolchain_args: ""
-            build_args: "-DENABLE_LIBXC=ON -DENABLE_MLALGO=ON -DENABLE_LIBRI=ON -DENABLE_DFTD4=ON"
+            build_args: "-DENABLE_LIBXC=ON -DENABLE_MLALGO=ON -DENABLE_LIBRI=ON -DENABLE_DFTD4=ON -DENABLE_PEXSI=ON"
             name: "Build extra components with GNU toolchain"
           - tag: intel
             external_toolchain_args: "--with-intel"

.github/workflows/test.yml

@@ -67,6 +67,7 @@ jobs:
             -DENABLE_RAPIDJSON=ON \
             -DENABLE_FLOAT_FFTW=ON \
             -DENABLE_DFTD4=ON \
+            -DENABLE_PEXSI=ON \
             -Werror=dev
 
 # Temporarily removed because no one maintains this now.