docker: fix docker entrypoint to optionally accept the command option

docker-entrypoint.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+set -e
+
+if [ $# -eq 0 ] || [ "${1#-}" != "$1" ]; then
+        set -- /bin/go-away \
+                --bind "${GOAWAY_BIND}" --bind-network "${GOAWAY_BIND_NETWORK}" --socket-mode "${GOAWAY_SOCKET_MODE}" \
+                --metrics-bind "${GOAWAY_METRICS_BIND}" --debug-bind "${GOAWAY_DEBUG_BIND}" \
+                --config "${GOAWAY_CONFIG}" \
+                --policy "${GOAWAY_POLICY}" --policy-snippets "/snippets" --policy-snippets "${GOAWAY_POLICY_SNIPPETS}" \
+                --client-ip-header "${GOAWAY_CLIENT_IP_HEADER}" --backend-ip-header "${GOAWAY_BACKEND_IP_HEADER}" \
+                --cache "${GOAWAY_CACHE}" \
+                --challenge-template "${GOAWAY_CHALLENGE_TEMPLATE}" --challenge-template-theme "${GOAWAY_CHALLENGE_TEMPLATE_THEME}" \
+                --slog-level "${GOAWAY_SLOG_LEVEL}" \
+                --acme-autocert "${GOAWAY_ACME_AUTOCERT}" \
+                --backend "${GOAWAY_BACKEND}" \
+                "$@"
+fi
+
+if [ "$1" = "go-away" ]; then
+        shift
+        set -- /bin/go-away "$@"
+fi
+
+exec "$@"