Update to HumHub 1.3.0 about humhub-docker HOT 3 CLOSED

I finished my first draft on the new "multi-build" rewrite and was able to remove some "magic" from the build-scripts. The size of the new expirimental image is down to 98mb in 16 layer (1.2.8: 228mb in 21). The new version can be tested with the "experimental"-tag. The code resides (for now) in the "version-1.3"-branch

Please be aware that there are some side effects on this changes:

• composer is not installed on the production image anymore. This improves size and security but could bring some problems during upgrades. We will see if a need for it arises. It can be installed by just adding a single line in the docker build-file.
• all system-dependencies (php + modules) got revised. It is possible that some of the removed packages where there for a non-obvious reason.
• because 1.3.x uses a different build process and has slightly different dependencies this new build process is incompatible to 1.2.x versions.
• the base-image has been upgraded to alpine:3.8 (from 3.7) this results in a upgrade to php (7.1 -> 7.2) as well.
• the app.log file has been added to supervisord and is now read (tail -f) to stderr. This could result in a massive growth of the docker-container-log, but was very helpful during bug hunting. If someone notices a negative performance impact this will be disabled again.

Besides this: The autoinstall-feature now uses a special command-controller to utilize the internal install routines of humhub. This opens the possibility to replace the built-in install-wizard completely. I am no yii/humhub developer, so I just implemented this out of the need for automated image testing. If someone would profit from a complete automated installation process please just open a issue!

I would really appreciate any tests on this new image before I release it to the wild (@pascalberger @bkmeneguello ?). Thanks to everyone for using/working on this image and as always: PR and feature-requests are highly welcomed!

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Just for the record: I am going to start working on this after my vacation (end of September). My plan for the new version is to use a Multi-Stage-Dockerfile. This will reduce the image-size and improves maintainability.

Some contribution, in form of PRs, comments or feature-requests, would be really helpful. It would be wonderful, if someone got an idea how to improve the "volume seeding" process.

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FYI: just updated "experimental" to new release 1.3.2
Image is currently rebuilding.

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