Viceroy exits with a nonzero status code on ctrl-C

[peterbourgon]

ugh /tmp/demo-app ~/Library/ApplicationSupport/fastly/viceroy -V
viceroy 0.2.4

ugh /tmp/demo-app ~/Library/ApplicationSupport/fastly/viceroy --config fastly.toml main.wasm
Sep 09 23:28:19.458  INFO checking if backend 'httpbin' is up
Sep 09 23:28:20.042  INFO backend 'httpbin' is up
Sep 09 23:28:20.043  INFO Listening on http://127.0.0.1:7878
^C

ugh /tmp/demo-app echo $status
130

This causes fastly compute serve to interpret a normal execution as having errored, which prints a big red message that is scary and bad 😨 and also not really true I guess? See fastly/cli#400.

tl;dr: Viceroy should return exit code 0 on ctrl-C/SIGINT