Community maintained Docker config for the spindle server

readme: add information about docker repo

hanna 5d6fc98f 2e2b6dbe

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readme.md
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Docker container and compose setup to run a [Tangled](https://tangled.sh) knot
and host your own repository data.
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## Pre-built Images
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There is a [repository](https://hub.docker.com/r/hqnna/knot) of pre-built images
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for tags starting at `v1.4.0-alpha` if you prefer.
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```
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docker pull hqnna/knot:v1.4.0-alpha
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```
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Note that these are *not* official images, you use them at your own risk.
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## Building The Image
By default the `Dockerfile` will build the latest tag, but you can change it