New PACKAGES logic

doublecommander/Dockerfile

@@ -2,13 +2,14 @@ ARG BUILD_FROM
 ARG BUILD_VERSION
 FROM ${BUILD_FROM}
 ENV BASHIO_VERSION=0.14.3
+ENV PACKAGES="jq \
+    samba \
+    smbclient"
 
 # Install bashio
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-    jq \
-    samba \
-    smbclient \
+    && apt-get install -y --no-install-recommends ${PACKAGES} \
+     \
     ##################
     # Install bashio #
     ##################