fix: Marshal yaml with 2 space indents

[alexstojda]

• Also return error when no releases found

[riclima]

FIY, but I discovered yesterday while playing around with making YAML patches using Go that yaml.v3 does not format lists like yaml.v2 on output (i.e., like kubectl does), with no option to go back to the old setting. Reasoning from the devs is that the old way had weird edge cases and new way doesn't, so "breaking" change in v3.

Old:

favorites:
  fruit: apple
  car: ford
fruits:
- apple
- orange

New:

favorites:
  fruit: apple
  car: ford
fruits:
  - apple
  - orange

I like new better. Makes more sense.

[alexstojda]

Yeah I like the new formatting better too, minus their decision to default the indents to 4 spaces lol.