[FIX] Snap font issue for sharp (#11514)

* Install fontconfig for snap

* Add fontconfig environment variables so sharp can find fonts

.snapcraft/resources/startRocketChat

@@ -3,6 +3,14 @@
 function start_rocketchat {
 	echo "Checking if oplog has been enabled, and enabling if not"
 	LC_ALL=C mongo $SNAP/bin/initreplset.js
+	
+	## For making fonts work for sharp
+	export XDG_DATA_HOME=$SNAP/usr/share
+
+	# Font Config
+	export FONTCONFIG_PATH=$SNAP/etc/fonts/config.d
+	export FONTCONFIG_FILE=$SNAP/etc/fonts/fonts.conf
+
 
 	export DEPLOY_METHOD=snap
 	export NODE_ENV=production

.snapcraft/snapcraft.yaml

@@ -16,7 +16,7 @@ apps:
     rocketchat-server:
         command: startRocketChat
         daemon: simple
-        plugs: [network, network-bind, desktop]
+        plugs: [network, network-bind]
     rocketchat-mongo:
         command: startmongo
         daemon: simple
@@ -54,10 +54,13 @@ parts:
         source: .
         stage-packages:
             - execstack
+            - fontconfig-config
         stage:
             - programs
             - main.js
             - .node_version.txt
+            - etc
+            - usr
     mongodb:
         build-packages:
             - wget