dcache: add deb package

dcache-build.yml

 stages:
   - build:rpm
-# - build:deb
+  - build:deb
 # - build:tar
 
 variables:
@@ -19,3 +19,9 @@ rpm:
   image: dcache/maven-java11-rpm-build
   script:
     - mvn $MAVEN_CLI_OPTS -am -pl packages/fhs -P rpm clean package
+
+deb:
+  stage: build:deb
+  image: dcache/maven-java11-deb-build
+  script:
+    - mvn $MAVEN_CLI_OPTS -am -pl packages/fhs -P deb clean package