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I tried to build an image using Ubuntu Trusty with ruby-2.4.1 and node v6.11.1. When the generator reached the postgres-client install, it failed. Adding RUN apt-get update to the Dockerfile solved this issue. Is there any reason not to run RUN apt-get update?

I already have a docker image in docker hub, but I need to log in first to use it?
How should I write the .yml file?

there are known issues compiling some 2.x versions of Ruby on some Linux distros due mostly to readline & SSL package versioning issues... we should, to the extent reasonably possible, mitigate these issues in generate.sh with some version-checking control flow that, when necessary, installs the requisite patches/packages for the versions of Ruby in question

• rvm/rvm#3548
• rbenv/ruby-build#526

When building the project, I'm getting an error

Could not find context "org-global".

I've set my DOCKER_USERNAME and DOCKER_PASSWORD vars, and org-global doesn't appear anywhere in my repo except in the README

Expected behaviour

I expect the config to be valid even though I do not supply a tag. If the tag really is required (I don't know if that's the case), it'd be helpful if a) it was stated or even better if b) the CLI forced me to enter a tag.

Steps to reproduce

Run the following in the dockerfile-wizard repo:

1. make ready
2. make setup
3. Choose a name for the project, leave the tag blank and choose a linux version. E.g. choose name: foo, linux version: 4 and leave the rest of the options blank.
4. Validate the config file and it will have an error, e.g. on the line which containsimage: $DOCKER_USERNAME/foo:.

FYI I'm using macOS Mojave.

Possible fix

Update the config template to not include a colon between name and tag. Only append a tag prepended with a colon when a tag is supplied.

I am getting this upon build, I am using Debian Stretch option.

: The value 'stable' is invalid for APT::Default-Release as such a release is not available in the sources

I recently finished my first build using this, and was hoping to look at the Dockerfile. The docs say it will be in the artifacts after the built, but this is all I see:

Is this a bug? Or am I not looking for it in the right place? Thanks.