Docker, CRON /bin/sh: 1: Syntax error: Bad fd number What's wrong?

Question

ubuntu

Tell me what am I doing wrong?
Trying to run cron in docker image php
Dockerfile:

FROM php:7-fpm
RUN apt-get update && apt-get install -y \
        libfreetype6-dev \
        libjpeg62-turbo-dev \
        libpng-dev \
        libzip-dev \
        zip \
    && docker-php-ext-configure gd --with-freetype --with-jpeg \
    && docker-php-ext-install -j$(nproc) gd \
    && docker-php-ext-install zip \
    && docker-php-ext-install mysqli \
    && docker-php-ext-install pdo_mysql

# Install cron
RUN apt-get update && apt-get install -y cron \
    nano
COPY cronfile /etc/cron.d/cronfile
RUN chmod 0644 /etc/cron.d/cronfile && \
    touch /var/log/cron.log && \
    chmod 0777 /var/log/cron.log && \
    crontab /etc/cron.d/cronfile

CMD bash -c "cron && php-fpm"

cronfile content:

* * * * * echo "Hello world" >> /var/log/cron.log 2>&1
# An empty line is required at the end of this file for a valid cron file.

Nothing is output in /var/log/cron.log.
in /var/mail/mail from cron comes an error:
/bin/sh: 1: Syntax error: Bad fd number

I tried to register in cronfile
SHELL=/bin/bash
Then I get an error in the mail

/bin/bash: 1
: ambiguous redirect

Answer 1

Resolved the issue. Maybe someone will help. If I create a cronfile in windows, some character is added to the beginning of the file, which is not readable by sh.
If you create a task file through the console, then everything will be fine.
I managed this way:

FROM php:7-fpm
RUN apt-get update && apt-get install -y \
        libfreetype6-dev \
        libjpeg62-turbo-dev \
        libpng-dev \
        libzip-dev \
        zip \
    && docker-php-ext-configure gd --with-freetype --with-jpeg \
    && docker-php-ext-install -j$(nproc) gd \
    && docker-php-ext-install zip \
    && docker-php-ext-install mysqli \
    && docker-php-ext-install pdo_mysql

# Install cron
RUN apt-get update && apt-get install -y cron \
    nano

RUN touch /etc/cron.d/cronfile && \
    touch /var/log/cron.log && \
    echo "SHELL=/bin/sh" >> /etc/cron.d/cronfile && \
    echo "PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin" >> /etc/cron.d/cronfile && \
    echo "* * * * * echo 777555 >> /var/log/cron.log 2>&1" >> /etc/cron.d/cronfile && \
    chmod 0644 /etc/cron.d/cronfile && \
    chmod 0777 /var/log/cron.log && \
    crontab /etc/cron.d/cronfile

CMD cron && php-fpm