make: Release pipeline

This commit adds new make targets for rpm, deb, and pacman packages.
It also adds a phony target that uploads tarballs of the packages,
along with their signed (and unsigned) checksums to the github release
page. Once the current commit is tagged as a release, run `make release`
to build the packages and upload them to github.

misc/make-deb-changelog.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# This script generates a deb changelog from the project's git history.
+
+# path to store the changelog
+CHANGELOG="releases/deb/changelog"
+# input to format flag for git tag
+TAG_FORMAT="-- %(creator) %(creatordate:format:%a, %d %b %Y %H:%M:%S %z) %(refname:lstrip=2)"
+# a list of tags to be parsed in the loop
+TAGS=$(git tag --sort=-creatordate --format="$TAG_FORMAT" | sed -r 's/[0-9]+ -[0-9]+ //')
+
+# placeholder for the next line of the list
+THIS_TAGLINE=
+
+# parse the list
+while read -r LAST_TAGLINE; do
+	# read ahead one tag
+	if [ "$THIS_TAGLINE" == "" ]; then
+		# store the tag for the next iteration
+		THIS_TAGLINE="$LAST_TAGLINE"
+		continue
+	fi
+
+	# grab the tags from the last column of the taglines
+	THIS_TAG=$(echo "$THIS_TAGLINE" | awk '{print $NF}')
+	LAST_TAG=$(echo "$LAST_TAGLINE" | awk '{print $NF}')
+
+	# print the release description
+	printf "mgmt (%s) unstable; priority=low\n\n" "$THIS_TAG" >> "$CHANGELOG"
+
+	# print all the commits between the tags
+	git shortlog -n "${LAST_TAG}...${THIS_TAG}" | sed -r '/\):/s/^/ * /' >> "$CHANGELOG"
+
+	# print the release signature
+	printf "%s\n\n\n" "$THIS_TAGLINE" | sed -r 's/[0-9]\.[0-9]\.[0-9]+//'>> "$CHANGELOG"
+
+	# first tag is special since there's no previous one
+	if [ "$LAST_TAG" == "0.0.1" ]; then
+		# print all the commits before the first tag
+		git shortlog -n "$LAST_TAG" | sed -r '/\):/s/^/ * /' >> "$CHANGELOG"
+		# print the release signature
+		printf "%s\n" "$LAST_TAGLINE" | sed -r 's/[0-9]\.[0-9]\.[0-9]+//'>> "$CHANGELOG"
+	fi
+
+	# store the tag for the next iteration
+	THIS_TAGLINE="$LAST_TAGLINE"
+done <<< "$TAGS"