[stable-2.6] Add Makefile to simplify upstream releases.

(cherry picked from commit 6a351c9c86)

Co-authored-by: Matt Clay <matt@mystile.com>

packaging/release/Makefile

@@ -0,0 +1,60 @@
+version ?= $(shell python versionhelper/version_helper.py --raw)
+
+.PHONY: all
+all:
+	@echo "USAGE:"
+	@echo
+	@echo "make release version={version} # current version is '${version}'"
+	@echo "make publish"
+	@echo
+	@echo "NOTE: Make sure to source hacking/env-setup before running these targets."
+
+.PHONY: release
+release: version summary changelog commit-release
+	git show -p
+	git status
+	@echo
+	@echo 'Run `git push` if you are satisfied with the changes.'
+
+.PHONY: version
+version:
+	sed -i.bak "s/^__version__ = .*$$/__version__ = '${version}'/" ../../lib/ansible/release.py
+	rm ../../lib/ansible/release.py.bak
+
+.PHONY: summary
+summary:
+	@echo 'release_summary: |\n\
+	   | Release Date: $(shell date '+%Y-%m-%d')\n\
+	   | `Porting Guide <https://docs.ansible.com/ansible/devel/porting_guides.html>`_' > \
+	../../changelogs/fragments/v${version}_summary.yaml
+
+.PHONY: changelog
+changelog:
+	changelogs/changelog.py release -vv && changelogs/changelog.py generate -vv
+	ansible-test sanity changelogs/
+
+.PHONY: commit-release
+commit-release:
+	git add ../../changelogs/ ../../lib/ansible/release.py
+	git commit -m "New release v${version}"
+
+.PHONY: publish
+publish: tag postversion commit-postversion
+	git show -p
+	git status
+	@echo
+	@echo 'Run `git push --follow-tags` if you are satisfied with the changes.'
+
+.PHONY: tag
+tag:
+	git tag -a v${version} -m "New release v${version}"
+
+.PHONY: postversion
+postversion:
+	sed -i.bak "s/^__version__ = .*$$/__version__ = '${version}.post0'/" ../../lib/ansible/release.py
+	rm ../../lib/ansible/release.py.bak
+
+.PHONY: commit-postversion
+commit-postversion:
+	git add ../../lib/ansible/release.py
+	git commit -m "Update Ansible release version to v${version}."