Big visual overhaul docker compsoe file etc

scripts/docker_dev_entrypoint.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+set -eu
+
+WAIT_RETRIES="${WAIT_RETRIES:-60}"
+WAIT_INTERVAL_SECONDS="${WAIT_INTERVAL_SECONDS:-2}"
+
+wait_for_service() {
+  label="$1"
+  host="$2"
+  port="$3"
+
+  python - "$label" "$host" "$port" "$WAIT_RETRIES" "$WAIT_INTERVAL_SECONDS" <<'PY'
+import socket
+import sys
+import time
+
+label, host, port, retries, interval = sys.argv[1], sys.argv[2], int(sys.argv[3]), int(sys.argv[4]), float(sys.argv[5])
+
+for attempt in range(1, retries + 1):
+    try:
+        socket.getaddrinfo(host, port, type=socket.SOCK_STREAM)
+        with socket.create_connection((host, port), timeout=2):
+            print(f"[docker-entrypoint] {label} ready at {host}:{port}")
+            raise SystemExit(0)
+    except OSError as exc:
+        print(
+            f"[docker-entrypoint] waiting for {label} ({attempt}/{retries}) at {host}:{port}: {exc}",
+            file=sys.stderr,
+        )
+        time.sleep(interval)
+
+print(f"[docker-entrypoint] {label} never became reachable at {host}:{port}", file=sys.stderr)
+raise SystemExit(1)
+PY
+}
+
+wait_for_service "database" "${DB_HOST:-127.0.0.1}" "${DB_PORT:-3306}"
+wait_for_service "redis" "${CHANNEL_REDIS_HOST:-127.0.0.1}" "${CHANNEL_REDIS_PORT:-6379}"
+
+python manage.py migrate --noinput
+exec python manage.py runserver 0.0.0.0:8000