Fix sync-github-release: merge all checksums into one file

Merges separate .sha256 files (from macOS build) into the main
checksums-sha256.txt, adds missing checksums, deduplicates.
Added macOS to release notes table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/sync-github-release.sh

@@ -0,0 +1,120 @@
+#!/usr/bin/env bash
+# Sync a release from Gitea to GitHub.
+# Downloads all binaries from Gitea release, creates GitHub release, uploads them.
+#
+# Prerequisites:
+#   gh auth login   (GitHub CLI authenticated)
+#
+# Usage:
+#   ./scripts/sync-github-release.sh v0.6.0
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+if [[ -f .env ]]; then
+    set -a; source .env; set +a
+fi
+
+TAG="${1:?Usage: $0 <tag> (e.g. v0.6.0)}"
+GITEA_URL="https://git.manko.yoga"
+GITEA_REPO="manawenuz/btest-rs"
+GITHUB_REPO="manawenuz/btest-rs"
+
+echo "=== Downloading assets from Gitea release ${TAG} ==="
+mkdir -p /tmp/btest-release-${TAG}
+cd /tmp/btest-release-${TAG}
+rm -f *.tar.gz *.zip *.txt
+
+# Get asset list from Gitea API
+ASSETS=$(curl -sf "${GITEA_URL}/api/v1/repos/${GITEA_REPO}/releases/tags/${TAG}" | \
+    python3 -c "import sys,json; [print(a['browser_download_url']) for a in json.load(sys.stdin).get('assets',[])]")
+
+if [ -z "$ASSETS" ]; then
+    echo "No assets found for ${TAG} on Gitea. Check if the release exists."
+    exit 1
+fi
+
+for url in $ASSETS; do
+    FILENAME=$(basename "$url")
+    echo "  Downloading: $FILENAME"
+    curl -sLO "$url"
+done
+
+# Merge all separate .sha256 files into checksums-sha256.txt
+# and remove the individual .sha256 files
+echo ""
+echo "=== Merging checksums ==="
+for sha_file in *.sha256; do
+    [ -f "$sha_file" ] || continue
+    echo "  Merging: $sha_file"
+    cat "$sha_file" >> checksums-sha256.txt
+    rm "$sha_file"
+done
+
+# Add checksums for any files not yet in checksums-sha256.txt
+for f in *.tar.gz *.zip; do
+    [ -f "$f" ] || continue
+    if ! grep -q "$f" checksums-sha256.txt 2>/dev/null; then
+        echo "  Adding checksum for: $f"
+        shasum -a 256 "$f" >> checksums-sha256.txt
+    fi
+done
+
+# Sort and deduplicate
+sort -u -k2 checksums-sha256.txt > checksums-sha256.tmp && mv checksums-sha256.tmp checksums-sha256.txt
+
+echo ""
+echo "Checksums:"
+cat checksums-sha256.txt
+
+echo ""
+echo "Files to upload:"
+ls -lh *.tar.gz *.zip checksums-sha256.txt 2>/dev/null
+
+echo ""
+echo "=== Creating GitHub release ${TAG} ==="
+gh release create "${TAG}" \
+    --repo "${GITHUB_REPO}" \
+    --title "btest-rs ${TAG}" \
+    --notes "## Downloads
+
+| Platform | Architecture | File |
+|----------|-------------|------|
+| Linux | x86_64 | btest-linux-x86_64.tar.gz |
+| Linux | aarch64 (RPi 64-bit) | btest-linux-aarch64.tar.gz |
+| Linux | armv7 (RPi 32-bit) | btest-linux-armv7.tar.gz |
+| Windows | x86_64 | btest-windows-x86_64.zip |
+| macOS | aarch64 (Apple Silicon) | btest-darwin-aarch64.tar.gz |
+| Docker | x86_64 | \`docker pull ghcr.io/manawenuz/btest-rs:${TAG}\` |
+
+### Quick Install (Linux)
+
+\`\`\`bash
+curl -LO https://github.com/${GITHUB_REPO}/releases/download/${TAG}/btest-linux-x86_64.tar.gz
+tar xzf btest-linux-x86_64.tar.gz
+sudo mv btest /usr/local/bin/
+\`\`\`
+
+### Raspberry Pi
+
+\`\`\`bash
+# 64-bit
+curl -LO https://github.com/${GITHUB_REPO}/releases/download/${TAG}/btest-linux-aarch64.tar.gz
+tar xzf btest-linux-aarch64.tar.gz
+sudo mv btest /usr/local/bin/
+
+# 32-bit
+curl -LO https://github.com/${GITHUB_REPO}/releases/download/${TAG}/btest-linux-armv7.tar.gz
+tar xzf btest-linux-armv7.tar.gz
+sudo mv btest /usr/local/bin/
+\`\`\`
+" \
+    ./*.tar.gz ./*.zip ./*.txt 2>/dev/null || true
+
+echo ""
+echo "=== Done! ==="
+echo "https://github.com/${GITHUB_REPO}/releases/tag/${TAG}"
+
+# Cleanup
+cd -
+rm -rf /tmp/btest-release-${TAG}