Broken support for Containerfile

[uosis]

Describe the bug

#686 broke support for using Containerfile instead of Dockerfile for builds. Dockerfile hardcoded here:

https://github.com/containers/podman-compose/pull/686/files#diff-956dd8b5765533c7e8f5bb94c8a1b4735dfcfd9cff54829f3494b87460fab50bR1297

which causes this logic to be skipped:

https://github.com/containers/podman-compose/blob/main/podman_compose.py#L2238

To Reproduce

Try to build any compose file that has build: . or similar and Containerfile instead of Dockerfile.

Expected behavior
Containerfile to be detected as before.
Actual behavior
Containerfile not detected

Output

$ podman-compose version
podman-compose version 1.1.0
podman version 5.0.2

Environment:

• OS: Linux