symlink specific gridss index files

genome_gridss_index folder may contain additional files that are staged by nextflow if they are part of the inputs (e.g. someone might have the .dict file in this folder if they created it via gridss.PrepareReference). This causes an error when we try to symlink the entire contents of the folder. Could we change this line to symlink the specific files of interest?

modules/local/virusbreakend/main.nf

@@ -29,7 +29,7 @@ process VIRUSBREAKEND {
 
     """
     # Symlink indices next to assembly FASTA
-    ln -s \$(find -L ${genome_gridss_index} -type f) ./
+    ln -s \$(find -L ${genome_gridss_index} -type f -name *.gridsscache -o -name *.img) ./
 
     virusbreakend \\
         ${args} \\