add a minimal build environment (#71)

* add a minimal build environment for systems where tools like make are not easily available

build/Dockerfile

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+FROM docker:18.09.0
+RUN apk add bash curl expect make nano jq
+WORKDIR /kopano-docker
+CMD ["bash"]

build/README.md

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+Helper container for systems where build requirements (bash, curl, jq, make) are not available (for example on Synology)
+
+Run the following command to enter the "build environment" (command may need to be run with `sudo` to work with the `docker` command):
+
+```
+$ ./run.sh
+bash-4.4$
+
+```
+
+Afterwards you can execute the `setup.sh` script, modify `.env` to your liking and run any make commands:
+
+```
+bash-4.4# ./setup.sh
+Creating an .env file for you
+Which tag do you want to use for Kopano Core components? [latest]:
+Which tag do you want to use for Kopano WebApp? [latest]:
+Which tag do you want to use for Z-Push? [latest]:
+Name of the Organisation for LDAP [Kopano Demo]:
+FQDN to be used (for reverse proxy) [kopano.demo]:
+Email address to use for Lets Encrypt. Use 'self_signed' as your email to create self signed certificates [self_signed]:
+Name of the BASE DN for LDAP [dc=kopano,dc=demo]:
+LDAP server to be used (defaults to the bundled OpenLDAP) [ldap://ldap:389]:
+Timezone to be used [Europe/Berlin.]:
+E-Mail Address displayed for the 'postmaster' [postmaster@kopano.demo]:
+Name/Address of Database server (defaults to the bundled one) [db]:
+Avaliable options:
+  1 ) de-at
+  2 ) de-ch
+  3 ) de-de
+  4 ) en
+  5 ) en-gb
+  6 ) es
+  7 ) fr
+  8 ) it
+  9 ) nl
+ 10 ) pl-pl
+Check language spell support (again to uncheck, ENTER when done):
+Avaliable options:
+  1 ) contactfax
+  2 ) desktopnotifications
+  3 ) filepreviewer
+  4 ) files
+  5 ) filesbackend-smb
+  6 ) filesbackend-owncloud
+  7 ) folderwidgets
+  8 ) gmaps
+  9 ) intranet
+ 10 ) mattermost
+ 11 ) mdm
+ 12 ) pimfolder
+ 13 ) quickitems
+ 14 ) smime
+ 15 ) titlecounter
+ 16 ) webappmanual
+ 17 ) zdeveloper
+Check for additional plugins (again to uncheck, ENTER when done):
+Integrate WhatsApp into DeskApp yes/no [no]:
+
+bash-4.4# make build-all
+docker build -t zokradonh/kopano_ssl ssl/
+Sending build context to Docker daemon  4.608kB
+[...]
+```
+
+After exiting the container run `docker-compose up -d`, which will have the images started you previously built.

build/run.sh

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+#!/bin/sh
+docker run \
+	--rm -it \
+	-u $(id -u ${USER}):$(id -g ${USER}) \
+	-v /var/run/docker.sock:/var/run/docker.sock \
+	-v ${PWD}/..:/kopano-docker/ \
+	$(docker build -q .)
+