Following up after more attempts:
Using “One Click automatic deploy” still gives the same results, hanging on that error message.
If I follow the “Customized command line for developers” instructions instead, I first get that timeout error, then if I cancel and push again, the build seems to complete, but then I get:
Compiled slug size: 535.1M is too large (max is 500M).
If I follow the “Got problems” instructions, the build again hangs at the same error message about caniuse-lite, no matter how many times I run it.
So… anyone? Hello? Is there any way to actually install RocketChat on Heroku?
Thanks very much,