fix(deploy): use absolute path to load component source

[FrankYang0529]

fixes #590

[michelleN]

Thank you @FrankYang0529 for fixing this bug. Manually tested. Also was nice to see the push method on PathBuf being used. I usually use join on Path so I got to learn something new. 🎉

We might also want to absolutize the app dir reference as a follow up.

Would you mind also signing your commit so we can merge?

[michelleN]

@FrankYang0529 info on signing if you need it: https://spin.fermyon.dev/contributing/

Lmk if you need any help.

[FrankYang0529]

We might also want to absolutize the app dir reference as a follow up.

Do you mean also put app_folder in DeployCommand? If yes, I can help to do the follow up.

Would you mind also signing your commit so we can merge?

I sign it. Thank you.

[itowlson]

This looks good - thanks! Comments are mostly minor nits; the only important thing is that when we try to open a file it's really important to provide a with_context with the file name because the stdlib error gives you no clue at all which file the operation has failed on - this was the issue I hit in #590! Thanks again!

[itowlson]

LGTM - thanks for the fixes!