add java

Author: benoitdion

action/Dockerfile

@@ -3,6 +3,11 @@ FROM $IMAGE
 
 ENV ANDROID_HOME /opt/android/sdk
 
+RUN apt-get update -qq \
+    && add-apt-repository ppa:openjdk-r/ppa \
+    && apt-get install -qq -y --no-install-recommends \
+        openjdk-8-jdk
+
 LABEL "com.github.actions.name"="Unity - Builder"
 LABEL "com.github.actions.description"="Build Unity projects for different platforms."
 LABEL "com.github.actions.icon"="box"
@@ -13,6 +18,7 @@ LABEL "homepage"="http://github.com/webbertakken/unity-actions"
 LABEL "maintainer"="Webber Takken <webber@takken.io>"
 
 
+
 ADD default-build-script /UnityBuilderAction
 ADD steps /steps
 RUN chmod -R +x /steps