Add kolide_flatpak_upgradeable table with exec parser

[Micah-Kolide]

Add a Kolide table for flatpak outdated packages. This one was very frustrating with how flatpak outputs data. Perhaps I should've started with only the app id and stopping there, but I was hoping to use the new StringDelimitedLineFunc to handle parsing the flatpak data table flatpak-table-printer.c. I was defeated in a truly brutal battle, the ages will never forget the terror that was flatpak tables.

Besides manually defining a header list for each Linux distribution I'm not sure how we could correctly parse flatpak remote-ls output. I did not feel like doing that at the moment, so that's why I've settled on only app id.

osquery> SELECT * FROM kolide_flatpak_upgradeable;
+---------+--------+-----+-------------------------------------+-------+
| fullkey | parent | key | value                               | query |
+---------+--------+-----+-------------------------------------+-------+
| 0/id    | 0      | id  | com.discordapp.Discord              | *     |
| 1/id    | 1      | id  | org.freedesktop.Platform.GL.default | *     |
| 2/id    | 2      | id  | org.freedesktop.Platform.GL.default | *     |
| 3/id    | 3      | id  | org.freedesktop.Platform.Locale     | *     |
| 4/id    | 4      | id  | org.freedesktop.Platform            | *     |
+---------+--------+-----+-------------------------------------+-------+

[RebeccaMahany]

LGTM, thank you for the documentation + the thorough tests -- just one suggestion

[RebeccaMahany]

🔥

[directionless]

OMG really?

[directionless]

You know... we used to have an exec tool that faked a pty. We deleted it a bit ago, but https://github.com/kolide/launcher/tree/19cb2b48a4df91021132ab5b62dadbff79a74def/pkg/ptycmd

Is it worth looking at bringing that back for headers and then doing something straightforward?

[Micah-Kolide]

I did go down the path of attempting to read the headers from tty, but I spent a while without making progress, so I stepped away from that solution. If there's prior art for this, then it's worth revisiting and trying out.

[Micah-Kolide]

Tried going down this list, but I wasn't able to get any output in my testing, so I'm going to merge this for now and revisit as needed.

[directionless]

(I'm pulling from the merge queue, because I want to ponder pty with micah. We can carry on if we don't want to pick that up)

[Micah-Kolide]

(I'm pulling from the merge queue, because I want to ponder pty with micah. We can carry on if we don't want to pick that up)

No worries, I'm good to discuss the options.