Docker with php 7.3 with unixodbc, Microsoft ODBC Driver 17 for Linux and pdo_sql

Dockerfile

FROM php:7.3-fpm

MAINTAINER Daniel Noyola <daniel.noyola.dev@gmail.com>

# Install Dependencies
RUN apt-get update && apt-get install -y locales unixodbc libgss3 odbcinst \
    devscripts debhelper dh-exec dh-autoreconf libreadline-dev libltdl-dev \
    unixodbc-dev wget unzip \
    && rm -rf /var/lib/apt/lists/* \
    && docker-php-ext-install pdo \
    && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen

# Add Microsoft repo for Microsoft ODBC Driver 17 for Linux
RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
    && curl https://packages.microsoft.com/config/debian/9/prod.list > /etc/apt/sources.list.d/mssql-release.list

RUN apt-get update && ACCEPT_EULA=Y apt-get install -y \
    apt-transport-https \
    msodbcsql17

# Enable the php extensions.
RUN pecl install pdo_sqlsrv-5.6.1 sqlsrv-5.6.1 \
    && docker-php-ext-enable pdo_sqlsrv sqlsrv

CMD ["php-fpm", "-F"]

EXPOSE 9000

Lines 14 ff. do not work in this order: you first have to add the apt sources, then update apt before you can install msodbcsql17.

As @BlueM mentioned

RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
    && curl https://packages.microsoft.com/config/debian/9/prod.list > /etc/apt/sources.list.d/mssql-release.list

# Add Microsoft repo for Microsoft ODBC Driver 17 for Linux
RUN apt-get update && ACCEPT_EULA=Y apt-get install -y \
    apt-transport-https \
    msodbcsql17

Updated!