Run all containers read-only (#314)

* switch containers in compose file to read-only
related to https://github.com/zokradonh/kopano-docker/issues/310
* make scheduler container read-only
* make meet container read-only
* fix konnect for read-only
* make core mostly read-only
* add custom location for ldap.cfg to default config
* sort config option for readability
* update makefile pull workaround
* make kdav read-only
* remove locale generation code from core startup
* fix commander tests
* fix store language tests
* add test for a dutch mailbox
* make it possible to run webapp read-only
* add locale hint to the compose file
* finish read-only mode for z-push

zpush/Dockerfile

@@ -61,6 +61,13 @@ RUN \
         ${ADDITIONAL_KOPANO_PACKAGES} \
     && rm -rf /var/cache/apt /var/lib/apt/lists
 
+# tweak to make the container read-only
+RUN mkdir -p /tmp/z-push/ && \
+    for i in /etc/z-push/*; do \
+        mv "$i" "$i.dist"; \
+        ln -s /tmp/z-push/"$(basename "$i")" "$i"; \
+    done
+
 COPY apache2-kopano.conf /etc/apache2/sites-available/kopano.conf
 
 # configure basics