Add AlmaLinux (#1920)

almalinux/README-short.txt

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+The official build of AlmaLinux OS.

almalinux/content.md

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+# AlmaLinux OS
+
+[AlmaLinux OS](https://almalinux.org/) is an Open Source and forever-free enterprise Linux distribution, governed and driven by the community, focused on long-term stability and a robust production-grade platform. AlmaLinux OS is a 1:1 binary compatible with RHEL® 8 and it was founded by the team behind the well-established [CloudLinux OS](https://www.cloudlinux.com/all-products/product-overview/cloudlinuxos).
+
+%%LOGO%%
+
+# About this image
+
+The `almalinux:latest` tag will always point to the latest stable release. Major releases are also tagged with their version (e.g. `almalinux:8`). All images for supported releases will be updated monthly or as needed for security fixes.
+
+## How It's Made
+
+The rootfs tarballs for this image are built using the [livemedia-creator tool](http://weldr.io/lorax/livemedia-creator.html). The build script and kikstart files are available in the [AlmaLinux/docker-images](https://github.com/AlmaLinux/docker-images) git repository.

almalinux/github-repo

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+https://github.com/AlmaLinux/docker-images

almalinux/issues.md

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+[https://bugs.almalinux.org](https://bugs.almalinux.org) or [GitHub](%%GITHUB-REPO%%/issues)

almalinux/license.md

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+View [license information](https://almalinux.org/legal/licensing-policy/) for the software contained in this image.

almalinux/maintainer.md

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+[The AlmaLinux OS Foundation](%%GITHUB-REPO%%)