refactor: add poetry as a dependency in the Makefile

Makefile

@@ -11,28 +11,28 @@ dev: build server
 
 build: reset statics dummy-data
 
-new-dummy-data: dummy-data
+# --- dummy data ---------------------------------------------------------------
 
-dummy-data:
+dummy-data: resolve-poetry
 	poetry run python dummy_data/make_random_tasks.py
 
 # ------------------------------------------------------------------------------
 
-refactor:
+refactor: resolve-poetry
 	poetry run black .
 	poetry run ruff --fix
 
-lint:
+lint: resolve-poetry
 	poetry run ruff check
 	poetry run mypy business_logic
 	poetry run mypy web_interface
 	poetry run mypy server
 
-tests:
+tests: resolve-poetry
 	poetry run pytest business_logic --noconftest
 
 .PHONY: server
-server:
+server: resolve-poetry
 	STATIC_FOLDER_NAME=$(static_folder_name) \
 	PATH_TO_TASK_DUMMY_DATA=$(path_to_task_dummy_data) \
 	poetry run uvicorn server.__main__:app --reload
@@ -63,6 +63,15 @@ reset: reset-statics
 reset-statics:
 	rm -rf $(static_folder_name)
 
+# --- dependencies -------------------------------------------------------------
+
+resolve-poetry:
+ifeq (, $(shell which poetry))
+	@echo "installing poetry v1.6.1..."
+	pip install poetry==1.6.1
+endif
+	@echo "poetry resolved"
+
 # --- functions ----------------------------------------------------------------
 
 # "build" will run the given 1 and pipe the stdout of 1 into 2 if 1 finishes without errors