message: Add linking for python3
  As in alpine /usr/bin/python owned by python2, workaround by linking /usr/bin/python3 to /usr/bin/python
diff: #-----------------------------------------
  FROM node:14-alpine3.13 AS builder
  RUN apk add --update-cache --repository https://alpine.global.ssl.fastly.net/alpine/v3.13/community/ \
  - python2 build-base sqlite-dev sqlite-libs vips-dev fftw-dev gcc g++ make libc6-compat
  + python3 build-base sqlite-dev sqlite-libs vips-dev fftw-dev gcc g++ make libc6-compat && ln -snf /usr/bin/python3 /usr/bin/python
  COPY pigallery2-release /app
  WORKDIR /app
  RUN npm install --unsafe-perm
  