Pin to working unity-3d image #125
                
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After initial investigation, it seems https://gitlab.com/gableroux/unity3d/-/commit/4d1eaa74cbec79386cda4f797e1db63ebcda1c20 and related commits broke the unity-builder android builds. Unity is no longer able to find the Android Tools or the JDK.
I was able to modify the Dockerfile to export an
ANDROID_HOMEenv variable to get past the first issue but so far haven't found how to configure the Unity JDK location. Setting aJAVA_HOMEenv variable doesn't seem to help.Until we find a fix upstream (https://gitlab.com/gableroux/unity3d), pinning to an older version of the unity-3d image. We probably don't want to merge this since the image hash isn't going to work on all platforms.
Corresponding issue at gitlab unity-3d: https://gitlab.com/gableroux/unity3d/-/issues/82