Generate changelog.md from github releases

generate.sh

# generate initial changelog.md from release history
# requires gh and jq tools
echo -e "# Changelog\n" >> CHANGELOG.md
for rel in $(gh release list | awk '{print $1}'); do
  echo "## ${rel}" >> CHANGELOG.md
  echo "" >> CHANGELOG.md
  gh release view --json body $rel | jq --raw-output '.body' | grep -v '^## Changelog' | sed -e 's/^#/##/g' >> CHANGELOG.md
  echo "" >> CHANGELOG.md
done

Makefile

# Update CHANGELOG.md with latest release
update-changelog:
	echo -e "# Changelog\n" >> temp.md
	rel=$$(gh release list | head -n 1 | awk '{print $$1}'); \
		echo "## $$rel" >> temp.md; \
		echo "" >> temp.md; \
		gh release view --json body $$rel | \
			jq --raw-output '.body' | \
			grep -v '^## Changelog' | \
			sed -e 's/^#/##/g' >> temp.md
	cat CHANGELOG.md | grep -v '^# Changelog' >> temp.md
	mv temp.md CHANGELOG.md