Add support for webkit

[rdmurphy]

Not sure why webkit was excluded seeing as it's one of the three major browsers supported by Playwright, but this PR adds it.

[simonw]

I skipped webkit because it needs a bit more work - right now I get the following error:

% shot-scraper https://www.whatismybrowser.com/detect/what-is-my-user-agent/ -b webkit
Traceback (most recent call last):
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/bin/shot-scraper", line 33, in <module>
    sys.exit(load_entry_point('shot-scraper', 'console_scripts', 'shot-scraper')())
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/Users/simon/Dropbox/Development/shot-scraper/shot_scraper/cli.py", line 166, in shot
    context, browser_obj = _browser_context(
  File "/Users/simon/Dropbox/Development/shot-scraper/shot_scraper/cli.py", line 217, in _browser_context
    browser_obj = p.chromium.launch(**browser_kwargs)
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/playwright/sync_api/_generated.py", line 11417, in launch
    self._sync(
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/playwright/_impl/_sync_base.py", line 111, in _sync
    return task.result()
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/playwright/_impl/_browser_type.py", line 90, in launch
    Browser, from_channel(await self._channel.send("launch", params))
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/playwright/_impl/_connection.py", line 39, in send
    return await self.inner_send(method, params, False)
  File "/Users/simon/.local/share/virtualenvs/shot-scraper-sQHOtKI2/lib/python3.10/site-packages/playwright/_impl/_connection.py", line 63, in inner_send
    result = next(iter(done)).result()
playwright._impl._api_types.Error: Unsupported chromium channel "webkit"

I'm confident it's possible to get it working, but I think the code here needs some fixes:

shot-scraper/shot_scraper/cli.py

Lines 210 to 217 in 4dc9c36

	browser_kwargs = dict(headless=not interactive, devtools=devtools)
	if browser == "chromium":
	browser_obj = p.chromium.launch(**browser_kwargs)
	elif browser == "firefox":
	browser_obj = p.firefox.launch(**browser_kwargs)
	else:
	browser_kwargs["channel"] = browser
	browser_obj = p.chromium.launch(**browser_kwargs)

[rdmurphy]

@simonw Derp — sorry about that. I had another branch in flight where I added that but forgot to pull it into this. Should be good now!

[simonw]

Tested this with:

shot-scraper 'https://www.whatismybrowser.com/detect/what-is-my-user-agent/' --browser webkit --height 400

And:

% shot-scraper javascript https://www.example.com/ 'navigator.userAgent' --browser webkit
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15"