add scripts to build & run with Docker

Or set DOCKER_BIN=podman to use Podman.

scripts/docker-run

@@ -0,0 +1,18 @@
+#!/bin/sh -eu
+
+: "${DOCKER_BIN:=docker}"
+
+cd "$RUN_DIR"
+
+[ -z "${DEBUG:-}" ] || set -x
+
+version=$(cat build/version)
+
+$DOCKER_BIN run \
+    --init \
+    -it --rm \
+    --read-only \
+    --memory '500m' \
+    --publish 127.0.0.1:8000:8000 \
+    --volume "$RUN_DIR"/data:/data \
+    "code.dumpr.org/ducklet/unwind":"$version"