Use any one of wget or curl but not both DOK-DL4001
Don't install two tools that have the same effect to avoid the additional cruft.
Do not use sudo DOK-DL3004
Do not use sudo as it leads to unpredictable behavior and possibly security vulnerabilities. Use a tool like gosu to perform user switching operations.
Possible parameter declaration detected DOK-SC1065
Use function_name() and refer to passed parameters as $1, $2 etc. Shell script functions behave just like scripts and other commands: - They always take 0 to N parameters, referred to by $1, $2 etc. They cannot declare parameters by name.
Delete the apt-get lists after installing anything DOK-DL3009
Cleaning up the apt cache and removing /var/lib/apt/lists helps keep the image size down. Since the RUN statement starts with apt-get update, the package cache will always be refreshed prior to apt-get install.
Use absolute WORKDIR DOK-DL3000
By using absolute paths you will not run into problems when a previous WORKDIR instruction changes. You also often don't know the WORKDIR context of your base container.