Discourse/discourse Docker image sources

Hello there, for some time I’m trying to make use of Dockerhub discourse/discourse image for self-hosting (I know it’s experimental, but I need DB/cache/msg bus externalized, so it’s a much better fit).

Question 1: where I can find Dockerfile / any extra recipes used to build it?
Question 2: the image is pretty huge, and today i’ve noticed it suddenly had ~250Mb added - the recently retagged 2026.7.2 has grown from around 1.15Gb to 1.4Gb (previous version of 2026.7.2 are not listed as not tagged, it was around the size of 2026.7.1). If someone involved with discoursebuild bot is here - is it something planned / expected?

Take a look at this post: