[Request]: Show warning instead of failing for unsupported platforms

### Feature or enhancement request details

Currently container build will just stop if it sees an unsupported platform, i wish this was just a warning or at least somewhere configurable by file or environmental variable, so i dont have to add `--arch amd64` to everything.

Current:
```
❯ container build -t test:test .
[+] Building 0.0s (0/1)
=> [resolver] fetching image...internal.cr/internal/base 0.0s
Error: unsupported: "Platform linux/arm64/v8"
```
Expected:
```
❯ container build -t test:test .
[+] Building 0.0s (0/1)
=> [resolver] fetching image...internal.cr/internal/base 0.0s
WARN: unsupported: "Platform linux/arm64/v8"
[…]
```

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