Update rultor config to use java8

Author: Ardesco

.rultor.yml

@@ -2,10 +2,14 @@ install: |-
   sudo apt-get install gsettings-desktop-schemas
 architect:
   - ardesco
+docker:
+  image: "velo/rultor8"
 decrypt:
   settings.xml: "repo/settings.xml.asc"
   pubring.gpg: "repo/pubring.gpg.asc"
   secring.gpg: "repo/secring.gpg.asc"
+env:
+  JAVA_HOME: /usr/lib/jvm/java-8-openjdk-amd64
 release:
   pre: false
   script: |-
@@ -14,5 +18,6 @@ release:
     mv /home/r/secring.gpg /home/r/gpg/secring.gpg
     sudo chmod -R 700 /home/r/gpg
     mvn versions:set "-DnewVersion=${tag}"
+    export PATH=$JAVA_HOME/bin:$PATH
     git commit -am "${tag}"
     mvn clean deploy -Prelease --settings /home/r/settings.xml