Add Forgejo namespace release workflow

Scripts/ci/build-release-artifacts.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
+cd "${repo_root}"
+
+release_ref="${RELEASE_REF:-manual-${GITHUB_SHA:-unknown}}"
+target="x86_64-unknown-linux-gnu"
+out_dir="${repo_root}/dist"
+staging="${out_dir}/burrow-${release_ref}-${target}"
+
+mkdir -p "${staging}"
+
+cargo build --locked --release -p burrow --bin burrow
+install -m 0755 target/release/burrow "${staging}/burrow"
+cp README.md "${staging}/README.md"
+
+tarball="${out_dir}/burrow-${release_ref}-${target}.tar.gz"
+tar -C "${out_dir}" -czf "${tarball}" "$(basename "${staging}")"
+shasum -a 256 "${tarball}" > "${tarball}.sha256"