Test compatibility with python pins

[machow]

From discussion with @juliasilge, let's set up a github action to ensure that changes made to R pins are compatible with the current version of python. E.g. save the pins from R, and the run py pins to ensure it can read, search, list, etc..

[juliasilge]

We never did set up cross-language testing to read from a board created by the other side, to read a pin created from the other side, etc. Let's figure out why we would see a warning:

In python:

from dotenv import load_dotenv
load_dotenv()
from pins import board_s3
from pins.tests.helpers import BoardBuilder

bb = BoardBuilder("s3")
board = bb.create_tmp_board("pins/tests/pins-compat")

# list path to temporary pins bucket, for copying into R
board.board

Switching to R:

board <- board_s3(<bucket_from_above>, prefix="<prefix_from_above>/")

# note that this also prints a warning
board %>% board_manifest()

Originally posted by @machow in #661 (comment)

[github-actions]

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