add file lock target

Makefile

@@ -1,4 +1,5 @@
 .ONESHELL:
+.SHELLFLAGS = -ec
 .SILENT:
 version := $(shell python -c "import tomllib;print(tomllib.load(open('pyproject.toml', 'rb'))['project']['version'])")
 
@@ -7,7 +8,7 @@ dist:
 	python -m build
 
 .PHONY: release
-release: dist
+release: tests dist
 	# check that changelog is updated
 	if ! grep ${version} CHANGELOG.rst
 	then
@@ -17,6 +18,21 @@ release: dist
 	twine upload dist/pykeepass-$(version)*
 	gh release create pykeepass-$(version) dist/pykeepass-$(version)*
 
+.PHONY: tests
+tests:
+	python tests/tests.py
+
+.PHONY: lock
+lock:
+	# make a requirements.txt lockfile
+	rm -rf .venv_lock
+	virtualenv .venv_lock
+	source .venv_lock/bin/activate
+	pip install .
+	python tests/tests.py
+	pip freeze > requirements.txt
+
+
 .PHONY: docs
 docs:
 	lazydocs pykeepass --overview-file README.md