Stop staging the 9.2 GB ChEMBL DB into every task workdir

GET_FINAL_METABOLITES_STATIC took chembl_db as a `path` input, so Nextflow
copied the ~9.2 GB SQLite DB into each task's work directory. With ~29
concurrent tasks that is hundreds of GB of I/O, against a process that also
declared only 1 GB of memory. Every task failed with exit 1 and retried ten
times, producing 746 errors and an empty 1b_final_metabolites/ output.

Pass the DB as a `val` path instead so tasks read it in place from the
dreamdock-data PVC, and give the process parameterised growing memory.

main_biotransformer.nf

@@ -274,18 +274,23 @@ process GET_FINAL_METABOLITES {
 }
 
 process GET_FINAL_METABOLITES_STATIC {
-    memory 1.GB
+    // The ChEMBL DB is ~9.2 GB. It is passed as a `val` path (not a staged `path`
+    // input) so Nextflow does not copy it into every task work directory — with
+    // concurrent tasks that multiplied into hundreds of GB of I/O. The DB lives on
+    // the dreamdock-data PVC and is opened read-only/immutable, so sharing one copy
+    // across tasks is safe.
+    memory { params.chembl_initial_memory.toInteger().GB + (task.attempt - 1) * params.chembl_growth_memory.toInteger().GB }
 
     container "${params.container_chembl}"
     containerOptions "${params.containerOptions}"
     publishDir "${params.outdir}/${params.project_name}/1b_final_metabolites", mode: 'copy'
 
-    errorStrategy { task.attempt <= 10 ? 'retry' : 'ignore' }
-    maxRetries 10
+    errorStrategy { task.attempt <= params.chembl_max_retries.toInteger() ? 'retry' : params.chembl_fail_action }
+    maxRetries { params.chembl_max_retries.toInteger() }
 
     input:
     path smiles_csv
-    path chembl_db  // Add ChEMBL SQLite database as input
+    val chembl_db  // Path to the ChEMBL SQLite DB on the PVC (not staged into the workdir)
 
     output:
     path "${smiles_csv.simpleName}.txt"