make the variable configurable

Author: reshnm

Taskfile_library.yaml

@@ -43,7 +43,7 @@ vars:
   MODULE_NAME:
     sh: 'cat "{{.ROOT_DIR2}}/go.mod" | grep "module " | sed "s/module //" | sed -E "s/[[:blank:]].*//"'
   NESTED_MODULES: '{{.NESTED_MODULES | default "" }}'
-  DOCKERFILE: '{{.TASKFILE_DIR2}}/Dockerfile'
+  DOCKERFILE: '{{.DOCKERFILE | default (print .TASKFILE_DIR2 "/Dockerfile") }}'
 
   LOCALBIN: '{{ env "LOCALBIN" | default ( .LOCALBIN | default (print .ROOT_DIR2 "/bin") ) }}'
   LOCALTMP: '{{ env "LOCALTMP" | default ( .LOCALTMP | default (print .ROOT_DIR2 "/tmp") ) }}'