install: source INSTALL_DIR/.env before creating compose file

server/install/install.sh

@@ -78,6 +78,7 @@ if [ ! -f "$INSTALL_DIR/.env" ]; then
   cp -v "$TMPFOLDER/server/.env.default" "$INSTALL_DIR/.env"
 fi
 echo "[INSTALL] Creating docker-compose.yml"
+. "$INSTALL_DIR/.env"
 envsubst < "$TMPFOLDER/server.docker-compose.yml" > "$INSTALL_DIR/docker-compose.yml"
 
 cd "$INSTALL_DIR"