Makefile create the upgrade sql files for the extension too

server/extension/Makefile

@@ -2,8 +2,20 @@
 # Once a version is released, it is not meant to be changed. E.g: once version 0.0.1 is out, it SHALL NOT be changed.
 EXTENSION = cdb_geocoder_server
 EXTVERSION = $(shell grep default_version $(EXTENSION).control | sed -e "s/default_version[[:space:]]*=[[:space:]]*'\([^']*\)'/\1/")
+SED = sed
 
-DATA = $(EXTENSION)--$(EXTVERSION).sql
+UPGRADABLE = \
+	0.0.1 \
+	$(END)
+
+UPGRADES = \
+	$(shell echo $(UPGRADABLE) | \
+		$(SED) 's/^/$(EXTENSION)--/' | \
+		$(SED) 's/$$/--$(EXTVERSION).sql/' | \
+		$(SED) 's/ /--$(EXTVERSION).sql $(EXTENSION)--/g')
+
+DATA = $(EXTENSION)--$(EXTVERSION).sql \
+	$(UPGRADES)
 
 REGRESS = $(notdir $(basename $(wildcard sql/*test.sql)))
 
@@ -12,13 +24,15 @@ PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)
 include $(PGXS)
 
-
 SOURCES_DATA = $(wildcard sql/$(EXTVERSION)/*.sql)
 
 $(DATA): $(SOURCES_DATA)
 	rm -f $@
 	cat $(SOURCES_DATA) >> $@
 
+$(EXTENSION)--%--$(EXTVERSION).sql: $(EXTENSION)--$(EXTVERSION).sql
+		cp $< $@
+
 all: $(DATA)
 
 # Only meant for development time, do not use once a version is released