Bundle a tested Traefik in releases, the image and the installer

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

deploy/fetch-traefik.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+# Downloads the official Traefik release for one platform and checks its checksum.
+#
+#   deploy/fetch-traefik.sh <os> <arch> <destination-dir>
+#
+# Blacktip ships this exact Traefik version, which is the one it was tested with.
+# Set TRAEFIK_VERSION to try another.
+set -eu
+OS=${1:?os} ARCH=${2:?arch} DEST=${3:?destination}
+VERSION=${TRAEFIK_VERSION:-3.7.16}
+case "$ARCH" in arm) ARCH=armv7 ;; esac
+EXT=tar.gz
+[ "$OS" = windows ] && EXT=zip
+BASE="https://github.com/traefik/traefik/releases/download/v$VERSION"
+FILE="traefik_v${VERSION}_${OS}_${ARCH}.$EXT"
+CACHE=${TRAEFIK_CACHE:-${TMPDIR:-/tmp}/traefik-cache}
+mkdir -p "$CACHE" "$DEST"
+[ -f "$CACHE/$FILE" ] || curl -fsSL -o "$CACHE/$FILE" "$BASE/$FILE"
+[ -f "$CACHE/checksums-$VERSION.txt" ] || curl -fsSL -o "$CACHE/checksums-$VERSION.txt" "$BASE/traefik_v${VERSION}_checksums.txt"
+want=$(grep " $FILE\$" "$CACHE/checksums-$VERSION.txt" | cut -d' ' -f1)
+[ -n "$want" ] || { echo "no checksum listed for $FILE" >&2; exit 1; }
+got=$(sha256sum "$CACHE/$FILE" | cut -d' ' -f1)
+[ "$want" = "$got" ] || { echo "checksum mismatch for $FILE" >&2; rm -f "$CACHE/$FILE"; exit 1; }
+if [ "$EXT" = zip ]; then
+	unzip -qo "$CACHE/$FILE" traefik.exe -d "$DEST"
+else
+	tar -xzf "$CACHE/$FILE" -C "$DEST" traefik
+fi
+echo "traefik $VERSION for $OS/$ARCH ready"