Hyphen isn't escaped in compose v2 env variables (block sequence entries are not allowed in this context)

[quentincaffeino]

.env:

SOME_VARIABLE="-"

docker-compose.yaml:

services:
  svc:
    environment:
      OTHER_VARIABLE: ${SOME_VARIABLE}

Gives an error: yaml: line 4: block sequence entries are not allowed in this context

Of course solution would be to wrap ${SOME_VARIABLE} in quotes but this used to work with previous composer so not sure if this is an issue. If not at least it might help someone searching for same problem.

[quentincaffeino]

Might be related to #1898

[ndeloof]

This issue was introduced by compose-spec/compose-go#142
to avoid comparable issues with variable content that might break the yaml tree, we probably better should revert and find a better way to manage variable substitution after the yaml tree has been parsed, but before types get converted.
Require we upgrade to go.yaml/v3

[ndeloof]

This has been fixed by compose-spec/compose-go#172