Updated README with info about multiarch builds and versioned tags
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							@@ -5,6 +5,14 @@
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Simple Postfix SMTP TLS relay [docker](http://www.docker.com) alpine based image with no local authentication enabled (to be run in a secure LAN).
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This image is available for the following architectures:
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* 386
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* amd64 (_latest_ and _alpine_ tags)
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* armv6
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* armv7
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* arm64
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It also includes rsyslog to enable logging to stdout.
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@@ -12,7 +20,16 @@ _If you want to follow the development of this project check out [my blog](https
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### Available image tags
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Currently we only handle a rolling release of new versions so only _latest_ tag is available, but there is [work in progress](https://github.com/juanluisbaptiste/docker-postfix/pull/29) to start releasing versioned images to be able to pin to specific versions in production deployments.
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We use semantic versioning for this image. For all supported architectures there are the following versioned tags:
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* Major (1)
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* Minor (1.0)
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* Patch (1.0.0)
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Additionally the amd64 architecture has the following tags:
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* _latest_
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* _alpine_
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*_NOTES_*:
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  * The _alpine_ tag has been switched to use the master branch, but it's irrelevant as it is the same as _latest_.
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