Install optional grapi dependencies (#347)

* install optional dependencies for grapi
* add hadolint exception

core/Dockerfile

@@ -39,6 +39,7 @@ LABEL maintainer=az@zok.xyz \
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 # install Kopano Core and refresh ca-certificates
+# hadolint ignore=DL3015
 RUN \
     # apt key has already been installed in base
     echo "deb [${KOPANO_REPOSITORY_FLAGS}] ${KOPANO_CORE_REPOSITORY_URL} ./" > /etc/apt/sources.list.d/kopano.list; \
@@ -51,7 +52,8 @@ RUN \
         && \
     coreversion=$(dpkg-query --showformat='${Version}' --show kopano-server) && \
     if dpkg --compare-versions "$coreversion" "gt" "8.7.0"; then \
-        apt-get -o Debug::pkgProblemResolver=true install --no-install-recommends -y \
+        # For grapi also install recommended packages
+        apt-get -o Debug::pkgProblemResolver=true install -y \
             kopano-grapi kopano-kapid; \
     fi && \
     if dpkg --compare-versions "$coreversion" "gt" "8.7.84"; then \