docker: use botan package from alpine instead of building from sources

Revert "Use alpine's botan package in the docker image"

This reverts commit 57889718f1c33a0ba963f3956ef7d5fb90cefc62.

Use alpine's botan package in the docker image

Merge pull request #6 from foosinn/multistage-docker

Remove build packages from docker image by using multistage Dockerfile.

Remove build packages from docker image by using multistage Dockerfile.

Merge branch 'postgresql' into 'master'

Add postgresql support

Closes #3237

See merge request louiz/biboumi!18

Update the docker images to enable postgresql, and document them

Aaaand move the biboumi.cfg file for docker

Move the Dockerfile inside an alpine subdirectory

Merge branch 'orm' into 'master'

Pure c++ sqlite3 ORM

Closes #3271

See merge request !11

Update the docker images and the gitlab-ci script to use sqlite3

Use alpine for the docker image, and simplify the config + run stuff

Using env variable directly used by the process, it’s easier than calling
sed on the configuration file before we start the process.  Also we don’t
need to start as root anymore, and it’s a lot cleaner.

Always chown biboumi /var/lib/biboumi when the docker container starts

This fixes permission problems when we bind a volume that is not owned by
the biboumi user.

Revert "Split the biboumi dockerfile into two, to be able to disable the cache"

This reverts commit 26eb28dc2368d14e171201a0c6b76b76b19e1ddc.

Split the biboumi dockerfile into two, to be able to disable the cache

docker: Properly handle and document the /var/lib/biboumi directory

Add a biboumi Dockerfile