Merge new CI pipeline with the changes from Peng.

General construction of the CI pipeline for testing, pulling, and pushing the OCI images to the gitlab CI registry.

workflow/configs/biohpc.config

-process {
-    executor = 'local'
+singularity {
+  enabled = true
+  runOptions = '--bind /vagrant:/vagrant'
+  cacheDir = "$baseDir/images/singularity"
 }
 
-executor {
-    name = 'local'
-    cpus = 1
+process {
+    executor = 'local'
 }