feat: add release packaging workflow and update script

.github/workflows/release.yml

@@ -0,0 +1,33 @@
+name: Package Release
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: write
+
+jobs:
+  package:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Create release archive
+        run: |
+          version="${GITHUB_REF_NAME}"
+          archive="note-c-${version}.tar.gz"
+          tar czf "${archive}" \
+            LICENSE \
+            note.h \
+            n_lib.h \
+            n_cjson.h \
+            n_*.c \
+            scripts/update_note_c.sh
+          echo "ARCHIVE=${archive}" >> "$GITHUB_ENV"
+
+      - name: Upload release asset
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh release upload "${{ github.event.release.tag_name }}" "${{ env.ARCHIVE }}"

scripts/update_note_c.sh

@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+#
+# Update the note-c C library to the latest release or a specified version.
+#
+# Usage:
+#   ./update_note_c.sh [options] [dest_dir] [version]
+#
+# Arguments:
+#   dest_dir  Directory to install note-c files into (default: current directory)
+#   version   Release version tag, e.g. v2.5.5 (default: latest)
+#
+# Options:
+#   --clean [dir]  Remove all non-library files from dir (default: current
+#                  directory). This is useful after cloning the repo to strip
+#                  it down to just the library. The script removes itself.
+#
+# Examples:
+#   ./update_note_c.sh                    # Latest release into current dir
+#   ./update_note_c.sh ./lib/note-c       # Latest release into ./lib/note-c
+#   ./update_note_c.sh . v2.5.4           # Specific version into current dir
+#   ./update_note_c.sh --clean            # Clean current dir to library only
+#   ./update_note_c.sh --clean ./note-c   # Clean a specific directory
+
+set -euo pipefail
+
+# Library files to keep during --clean
+LIBRARY_FILES=(
+    LICENSE
+    note.h
+    n_lib.h
+    n_cjson.h
+    n_atof.c
+    n_b64.c
+    n_cjson.c
+    n_cjson_helpers.c
+    n_cobs.c
+    n_const.c
+    n_ftoa.c
+    n_helpers.c
+    n_hooks.c
+    n_i2c.c
+    n_md5.c
+    n_printf.c
+    n_request.c
+    n_serial.c
+    n_str.c
+    n_ua.c
+)
+
+clean() {
+    local dir="${1:-.}"
+    dir=$(cd "${dir}" && pwd)
+
+    # Remove everything in the directory that isn't a library file
+    for entry in "${dir}"/* "${dir}"/.*; do
+        name=$(basename "${entry}")
+        [ "${name}" = "." ] || [ "${name}" = ".." ] && continue
+
+        local is_library=false
+        for f in "${LIBRARY_FILES[@]}"; do
+            if [ "${name}" = "${f}" ]; then
+                is_library=true
+                break
+            fi
+        done
+
+        if [ "${is_library}" = false ]; then
+            rm -rf "${entry}"
+        fi
+    done
+
+    echo "Cleaned ${dir} to library files only."
+}
+
+if [ "${1:-}" = "--clean" ]; then
+    clean "${2:-.}"
+    exit 0
+fi
+
+REPO="blues/note-c"
+DEST="${1:-.}"
+VERSION="${2:-}"
+
+if ! command -v curl &>/dev/null; then
+    echo "Error: curl is required but not found." >&2
+    exit 1
+fi
+
+# Resolve the version tag
+if [ -z "${VERSION}" ]; then
+    VERSION=$(curl -sfL \
+        -H "Accept: application/vnd.github+json" \
+        "https://api.github.com/repos/${REPO}/releases/latest" \
+        | grep '"tag_name"' | cut -d'"' -f4)
+    if [ -z "${VERSION}" ]; then
+        echo "Error: failed to determine latest release version." >&2
+        exit 1
+    fi
+    echo "Latest release: ${VERSION}"
+else
+    echo "Requested release: ${VERSION}"
+fi
+
+ARCHIVE="note-c-${VERSION}.tar.gz"
+URL="https://github.com/${REPO}/releases/download/${VERSION}/${ARCHIVE}"
+
+# Download the archive
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "${TMPDIR}"' EXIT
+
+echo "Downloading ${URL}..."
+if ! curl -fL -o "${TMPDIR}/${ARCHIVE}" "${URL}"; then
+    echo "Error: download failed. Check that version '${VERSION}' exists and has a release archive." >&2
+    exit 1
+fi
+
+# Extract into destination
+mkdir -p "${DEST}"
+tar xzf "${TMPDIR}/${ARCHIVE}" -C "${DEST}"
+
+echo "note-c ${VERSION} installed to ${DEST}"