SEP-1652: Run check_nomad_payload_size via venv make target

Add make check-nomad-payload-size and a clear import error when
python_minifier is missing from the active Python interpreter.

Author: olucasandrade

Makefile

@@ -195,6 +195,9 @@ regen-pbm-payloads: venv
 regen-pbm-payloads-check: venv
 	@$(DARWIN_DYLD) "${VENV_BIN}"/python scripts/gen_pbm_payloads.py --check
 
+check-nomad-payload-size: venv
+	@$(DARWIN_DYLD) "${VENV_BIN}"/python scripts/check_nomad_payload_size.py $(ARGS)
+
 changelog-add:
 ifndef TICKET
 	$(error TICKET is required. Usage: make changelog-add TICKET=SEP-XXX SECTION=added MSG="description")

scripts/check_nomad_payload_size.py

@@ -22,7 +22,14 @@
 import io
 import sys
 
-from python_minifier import minify
+try:
+    from python_minifier import minify
+except ModuleNotFoundError:
+    sys.exit(
+        "python_minifier is not installed for this Python interpreter.\n"
+        "Use the project venv: venv/bin/python scripts/check_nomad_payload_size.py ...\n"
+        "Or: make check-nomad-payload-size ARGS='--report <path>...'"
+    )
 
 NOMAD_PAYLOAD_SIZE_LIMIT = 16384