fix(docker): Build arg

Author: leocavalcante

Dockerfile

@@ -11,7 +11,7 @@ ARG WITHOUT_WATCHR
 ENV WITHOUT_WATCHR=$WITHOUT_WATCHR
 
 COPY rootfs /
-RUN sed -i  "s/latest-stable/v${ALPINE}/g" /etc/apk/repositories && \
+RUN sed -i 's/latest-stable/v$ALPINE/g' /etc/apk/repositories && \
     apk update && apk upgrade && apk add --no-cache \
         git \
         docker-cli \