publish new images after recent PRs are merged and tested

[szaimen]

Follow up to #168

tested:

• fix connection issues with collabora #189
• Install some apps by default #190
• Dependency updates #194
• update opcache settings #199
• switch apache and borgbackup to slim image for reduced size #200
• migrate watchtower container to alpine #201
• migrate postgres container to alpine #202
• migrate redis container to alpine #203
• migrate nextcloud container to alpine #204
• set up shellcheck #211 (test if the mastercontainer starts)

Tasks to do for new release:

• increase the version number in https://github.com/nextcloud/all-in-one/blob/main/php/templates/containers.twig#L19
• build new images. See https://github.com/nextcloud/all-in-one/blob/main/develop.md#how-to-build-new-containers
• deploy from develop to latest. See https://github.com/nextcloud/all-in-one/blob/main/develop.md#how-to-promote-builds-from-develop-to-latest
  • all-in-one
  • aio-nextcloud
  • aio-apache
  • aio-borgbackup
  • aio-watchtower
  • aio-postgresql
  • aio-redis
• tag a new release here on github which fits the version number (and use vX.Y.Z as tag and title, use the autogenerated changelog)
• rename next milestone to the same version number
• create a new milestone that is called next
• move all open issues/PRs to that new milestone
• close the old milestone