Allow overriding the Lmod GPU driver check

EESSI-install-software.sh

@@ -214,6 +214,9 @@ fi
 #       if not, an error is produced, and the bot flags the whole build as failed (even when not installing GPU software)
 # ${EESSI_PREFIX}/scripts/gpu_support/nvidia/link_nvidia_host_libraries.sh
 
+# Don't run the Lmod GPU driver check when doing builds (may not have a GPU, and it's not relevant for vanilla builds anyway)
+export EESSI_OVERRIDE_GPU_CHECK=1
+
 # use PR patch file to determine in which easystack files stuff was added
 changed_easystacks=$(cat ${pr_diff} | grep '^+++' | cut -f2 -d' ' | sed 's@^[a-z]/@@g' | grep '^easystacks/.*yml$' | egrep -v 'known-issues|missing') 
 if [ -z "${changed_easystacks}" ]; then

create_lmodsitepackage.py

@@ -130,8 +130,9 @@
     end
     -- when loading CUDA enabled modules check if the necessary driver libraries are accessible to the NESSI linker,
     -- otherwise, refuse to load the requested module and print error message
-    local haveGpu = mt:haveProperty(simpleName,"arch","gpu")
-    if haveGpu then
+    local checkGpu = mt:haveProperty(simpleName,"arch","gpu")
+    local overrideGpuCheck = os.getenv("EESSI_OVERRIDE_GPU_CHECK")
+    if checkGpu and (overrideGpuCheck == nil) then
         local arch = os.getenv("EESSI_CPU_FAMILY") or ""
         local cudaVersionFile = "/cvmfs/pilot.nessi.no/host_injections/nvidia/" .. arch .. "/latest/cuda_version.txt"
         local cudaDriverFile = "/cvmfs/pilot.nessi.no/host_injections/nvidia/" .. arch .. "/latest/libcuda.so"
@@ -140,7 +141,9 @@
         if not (cudaDriverExists or singularityCudaExists)  then
             local advice = "which relies on the CUDA runtime environment and driver libraries. "
             advice = advice .. "In order to be able to use the module, you will need "
-            advice = advice .. "to make sure NESSI can find the GPU driver libraries on your host system.\\n"
+            advice = advice .. "to make sure NESSI can find the GPU driver libraries on your host system. You can "
+            advice = advice .. "override this check by setting the environment variable EESSI_OVERRIDE_GPU_CHECK but "
+            advice = advice .. "the loaded application will not be able to execute on your system.\\n"
             advice = advice .. refer_to_docs
             LmodError("\\nYou requested to load ", simpleName, " ", advice)
         else