feat: implement retina shell CLI command · microsoft/retina@663ed7f

docs/06-Troubleshooting/shell.md:21 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:37 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:46 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:74 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:97 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:116 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

docs/06-Troubleshooting/shell.md:141 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

shell/README.md:14:79 MD047/single-trailing-newline Files should end with a single newline character

Failed with exit code: 1

The following actions use a deprecated Node.js version and will be forced to run on node20: DavidAnson/markdownlint-cli2-action@v9. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

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