gt2n: Add gt2n to PUBLIC PDKs in scripts dir.

Signed-off-by: Matthew Guthaus <mrg@ucsc.edu>

Author: mguthaus

flow/scripts/variables.mk

@@ -17,7 +17,7 @@ export UTILS_DIR     ?= $(FLOW_HOME)/util
 export SCRIPTS_DIR   ?= $(FLOW_HOME)/scripts
 export TEST_DIR      ?= $(FLOW_HOME)/test
 
-PUBLIC=nangate45 sky130hd sky130hs asap7 ihp-sg13g2 gf180
+PUBLIC=nangate45 sky130hd sky130hs asap7 ihp-sg13g2 gf180 gt2n
 
 ifeq ($(origin PLATFORM), undefined)
   $(error PLATFORM variable not set.)