Remove apt trash

Dockerfile

@@ -32,7 +32,8 @@ RUN chmod 0600 /opt/keys/*; \
     cd /opt/json-wsdl; \
     composer install --no-scripts --no-interaction --no-progress; \
     chmod +x /opt/docsis.sh; \
-    bash -c /opt/docsis.sh
+    bash -c /opt/docsis.sh; \
+    rm -rf /var/lib/apt/lists/*
     
 COPY docsis/custom_mibs /usr/share/snmp/mibs/