build: Regenerate the generated file as the default target

When modifying the schema, regenerating the file can be challenging.
This change sets the autogenerate file as the default target, m
aking the process more convenient and simplifying our workflow.

Fixes #6365
Report-by: Dusty Daemon
Changelog-None
Signed-off-by: Vincenzo Palazzo <[email protected]>

Makefile

@@ -277,7 +277,7 @@ ifeq ($(HAVE_POSTGRES),1)
 LDLIBS += $(POSTGRES_LDLIBS)
 endif
 
-default: show-flags all-programs all-test-programs doc-all default-targets $(PYTHON_GENERATED)
+default: show-flags gen all-programs all-test-programs doc-all default-targets $(PYTHON_GENERATED)
 
 ifneq ($(SUPPRESS_GENERATION),1)
 FORCE = FORCE
@@ -597,6 +597,8 @@ CHECK_GEN_ALL = \
 	.msggen.json \
 	doc/index.rst
 
+gen:  $(CHECK_GEN_ALL)
+
 check-gen-updated:  $(CHECK_GEN_ALL)
 	@echo "Checking for generated files being changed by make"
 	git diff --exit-code HEAD