update to latest heroku-24

[jrochkind]

• vips buildpack no longer supported, but just adding libvips-tools to Aptfile should give us a good recent vips version that will work (I've tested somewhat)

[jrochkind]

heroku-24 removed ghostscript as a default install, which would be inconvenient for us.

But it looks like they may be adding it back? So let's hope they do and see if we can wait for a heroku-24 release that includes it before updating. heroku/base-images#324

See also https://www.reddit.com/r/Heroku/comments/1fj3cr4/ghostscript_on_heroku24/

If they don't, it looks like this custom buildpack would probably work (have done some initial but not thorough testing that looked good). https://github.com/thegrizzlylabs/heroku-buildpack-ghostscript

[jrochkind]

ok ghostscript is on heroku-24 now, so we could resume this any time!

heroku/base-images#324 (comment)

[jrochkind]

OK weird thing trying to deploy to heroku-24 stack --

error on deploy,

remote:        Running: rake assets:precompile
remote:        I, [2024-12-17T12:16:40.080300 #9904]  INFO -- honeybadger: ** [Honeybadger] Reporting error id=52144093-2c98-4b02-ac52-034b4657a615 level=1 pid=9904
remote:        rake aborted!
remote:        ArgumentError: Invalid Timezone: US/Eastern (ArgumentError)
remote:
remote:              ActiveSupport::TimeZone[time_zone] || raise(ArgumentError, "Invalid Timezone: #{time_zone}")

Code is the same (including same version of Rails) that deploys properly on Heroku-22.

TZ ENV var is actually set to America/New_York, not US/Eastern -- not sure where US/Eastern is coming from, maybe heroku-24 has other timezone variables set that Rails is using preferentially? Not finding anything on that.

May file a heroku ticket if I can't find anything soon. The inability to deploy makes it hard to investigate, as I don't have a working heroku-24 with our build stack to log into and look at!

[jrochkind]

OK, we do have config.time_zone = "US/Eastern" in our config/application.rb.

Maybe that stops being a valid time zone on the ubuntu version in heroku-24? Let's try setting it to America/New_York -- or even actually take it from the ENV TZ if available!

[jrochkind]

OK, solved TZ. Now it's failing our system spec for making sure tesseract languages are installed.

Because:

~ $ tesseract --list-langs
List of available languages in "/app/.apt/usr/share/tesseract-ocr/4.00/tessdata/" (0):

It's supposed to actually list hte languages.

And there is nothing at /app/.apt/usr/share/tesseract-ocr/4.00/tessdata/.

Aha, we have an ENV var TESSDATA_PREFIX set to /app/.apt/usr/share/tesseract-ocr/4.00/tessdata. Clearly that needs to be something different on heroku-24...

Aha, we now have tesseract 5.x, so it needs to be: /app/.apt/usr/share/tesseract-ocr/5/tessdata/