Add singularity mini lesson

[multimeric]

I am aware there is a separate lesson for singularity, but it's beneficial for us to teach it this way. There was also some incidental text in the examples lesson that implied you wanted something in the same lesson.

[github-actions]

Thank you!

Thank you for your pull request 😃

🤖 This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

If you have files that automatically render output (e.g. R Markdown), then you should check for the following:

• 🎯 correct output
• 🖼️ correct figures
• ❓ new warnings
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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries-incubator/docker-introduction/compare/md-outputs..md-outputs-PR-254

The following changes were observed in the rendered markdown documents:

 docker-image-examples.md | 18 +-------------
 md5sum.txt               |  3 ++-
 singularity.md (new)     | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 18 deletions(-)

What does this mean?

If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

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⏱️ Updated at 2024-09-18 13:11:04 +0000

[multimeric]

@jcohen02 any thoughts on this?