Nextflow lint results

❌ Errors

Error: main.nf:161:1: Statements cannot be mixed with script declarations -- move statements into a process, workflow, or function
```
workflow.onComplete {
^
```

Warning: modules/nf-core/blast/blastn/main.nf:63:9: Variable was declared but not used
```
    def args = task.ext.args ?: ''
        ^^^^
```
Warning: modules/nf-core/blast/makeblastdb/main.nf:42:9: Variable was declared but not used
```
    def args           = task.ext.args ?: ''
        ^^^^
```
Warning: modules/sanger-tol/samtools/mergedup/main.nf:56:9: Variable was declared but not used
```
    def args      = task.ext.args  ?: ''
        ^^^^
```
Warning: subworkflows/local/generate_genomes/main.nf:10:5: Parameter was not used -- prefix with _ to suppress warning
```
    barcodes
    ^^^^^^^^
```
Warning: subworkflows/local/generate_html_report/main.nf:20:5: Parameter was not used -- prefix with _ to suppress warning
```
    params_file                // channel: [ params_file ]
    ^^^^^^^^^^^
```
Warning: subworkflows/local/utils_nfcore_ascc_pipeline/main.nf:39:5: Parameter was not used -- prefix with _ to suppress warning
```
    monochrome_logs   // boolean: Do not use coloured log outputs
    ^^^^^^^^^^^^^^^
```
Warning: subworkflows/local/utils_nfcore_ascc_pipeline/main.nf:209:5: Variable was declared but not used
```
    versions = ch_versions.mix(PREPARE_BLASTDB.out.versions)
    ^^^^^^^^
```