Fix error. (pip: command not found)

Required install py3-pip

Author: youyo

Dockerfile

@@ -1,8 +1,7 @@
 FROM alpine:3
 
-RUN apk --update --no-cache add nodejs nodejs-npm python3 jq curl bash && \
-	ln -sf /usr/bin/python3 /usr/bin/python && \
-	ln -sf /usr/bin/pip3 /usr/bin/pip
+RUN apk --update --no-cache add nodejs nodejs-npm python3 py3-pip jq curl bash && \
+	ln -sf /usr/bin/python3 /usr/bin/python
 
 COPY entrypoint.sh /entrypoint.sh