ci: build Linux release packages

packaging/linux/resolve-version.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+version=${1:-1.0.0}
+
+if [[ ${GITHUB_REF_TYPE:-} == "tag" ]]; then
+	if [[ ! ${GITHUB_REF_NAME:-} =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+		echo "Linux release tags must use vMAJOR.MINOR.PATCH" >&2
+		exit 1
+	fi
+	version=${GITHUB_REF_NAME#v}
+fi
+
+if [[ ! $version =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+	echo "Version must use MAJOR.MINOR.PATCH" >&2
+	exit 1
+fi
+
+IFS=. read -r major minor patch <<< "$version"
+parts=("$major" "$minor" "$patch")
+
+for index in "${!parts[@]}"; do
+	part=${parts[$index]}
+	if [[ $part != "0" && $part == 0* ]]; then
+		echo "Version components must be canonical integers without leading zeroes" >&2
+		exit 1
+	fi
+	if (( ${#part} > 5 )) || (( 10#$part > 65535 )); then
+		echo "Version components must be between 0 and 65535" >&2
+		exit 1
+	fi
+	if (( index == 0 && 10#$part == 0 )); then
+		echo "The major version must be non-zero" >&2
+		exit 1
+	fi
+done
+
+printf '%s\n' "$version"