app: Wrap build sections with details tag

[seemethere]

Allows for build sections to wrapped in a <details> tag to reduce the spam from the comment itself.

Do note:

This is my first time working in Haskell so I'm not entirely sure if I got the syntax right.

Signed-off-by: Eli Uriegas eliuriegas@fb.com

[kostmo]

Can you try posting a manually-crafted comment in this PR the embeds a multi-line-code-block (triple backticks) inside the \<details> tag? I wasn't able to get it to work; it seems that markdown formatting gets ignored when inside an html tag?

E.g., I can't seem to put this:

foo
bar

inside this:

open me

``` foo bar ```

[kostmo]

Oooh I figured it out:

open me

foo
bar

[seemethere]

Yup that'd look like:

I contain a code block

```python class Codeblock(object): def __init__(self, the_stuff): self.the_stuff = the stuff ```

This might be a nested code block


[kostmo]

Seems like the trick is leaving a blank line in between the html tags and the markdown?

[seemethere]

Yup, I think I may need to modify the code to add a newline between the code blocks and the ending </details> tag

[seemethere]

Just modified my PR to do that