add debian packaging

rename builds to include the version

bin/build-debs.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+VERSION="$1"
+
+for ARCH in amd64 arm64; do
+  fpm -t deb -p "build/expiration-check-$VERSION-$ARCH.deb" \
+	--architecture $ARCH --version "$VERSION" \
+	"build/expiration-check-linux-$ARCH"=/usr/bin/expiration-check
+done

bin/rename-builds.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+VERSION="$1"
+
+for OS in linux windows darwin; do
+  if [ "$OS" = "windows" ]; then
+	EXTENSION=".exe"
+  else
+	EXTENSION=
+  fi
+
+  for ARCH in amd64 arm64; do
+	mv -v \
+      "build/expiration-check-${OS}-${ARCH}${EXTENSION}" \
+	  "build/expiration-check-${VERSION}-${OS}-${ARCH}${EXTENSION}"
+  done
+done