specgen,wasm: switch to crun-wasm wherever applicable

Whenever image has `arch` and `os` configured for `wasm/wasi` switch to
`crun-wasm` as extension if applicable, following will only work if
`podman` is using `crun` as default runtime.

[NO NEW TESTS NEEDED]
[NO TESTS NEEDED]
A test for this can be added when `crun-wasm` is part of CI.

Signed-off-by: Aditya R <arajan@redhat.com>

libpod/options.go

@@ -142,6 +142,17 @@ func WithOCIRuntime(runtime string) RuntimeOption {
 	}
 }
 
+// WithCtrOCIRuntime specifies an OCI runtime in container's config.
+func WithCtrOCIRuntime(runtime string) CtrCreateOption {
+	return func(ctr *Container) error {
+		if ctr.valid {
+			return define.ErrCtrFinalized
+		}
+		ctr.config.OCIRuntime = runtime
+		return nil
+	}
+}
+
 // WithConmonPath specifies the path to the conmon binary which manages the
 // runtime.
 func WithConmonPath(path string) RuntimeOption {

pkg/specgen/generate/container_create.go

@@ -122,6 +122,16 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 	if err != nil {
 		return nil, nil, nil, err
 	}
+
+	if imageData != nil {
+		ociRuntimeVariant := rtc.Engine.ImagePlatformToRuntime(imageData.Os, imageData.Architecture)
+		// Don't unnecessarily set and invoke additional libpod
+		// option if OCI runtime is still default.
+		if ociRuntimeVariant != rtc.Engine.OCIRuntime {
+			options = append(options, libpod.WithCtrOCIRuntime(ociRuntimeVariant))
+		}
+	}
+
 	if newImage != nil {
 		// If the input name changed, we could properly resolve the
 		// image. Otherwise, it must have been an ID where we're