Capitalize dockerfile

Dockerfile

@@ -0,0 +1,12 @@
+FROM alpine:3.8
+
+ENV file /usr/local/bin/run.sh
+
+RUN apk add --no-cache --update curl grep bash
+
+RUN echo '*  *  *  *  * ${file}' > /etc/crontabs/root
+
+COPY ./run.sh ${file}
+RUN chmod +x ${file}
+
+CMD ["crond", "-l2", "-f"]