Update src/main/groovy/nfcmgg/plugin/CmggExtension.groovy

Co-authored-by: Nicolas Vannieuwkerke <101190534+nvnieuwk@users.noreply.github.com>

Author: matthdsm

src/main/groovy/nfcmgg/plugin/CmggExtension.groovy

@@ -31,20 +31,23 @@ class CmggExtension extends PluginExtensionPoint {
     /*
      * Parse first line of a FASTQ file, return the flowcell id and lane number.
      */
+    @Function
     String flowcellLaneFromFastq(Path path) {
         return nfcmgg.plugin.utils.FastqUtils.flowcellLaneFromFastq(path)
     }
 
     /*
      * Get first line of a FASTQ file
      */
+    @Function
     String readFirstLineOfFastq(Path path) {
         return nfcmgg.plugin.utils.FastqUtils.readFirstLineOfFastq(path)
     }
 
     /*
      * Add readgroup to meta and remove lane
      */
+    @Function
     List addReadgroupToMeta(Map meta, List<Path> files, Map params) {
         return nfcmgg.plugin.utils.FastqUtils.addReadgroupToMeta(meta, files, params)
     }