feat: add protoc-gen-openapi (gnostic)

tools/sgprotocgenopenapi/tools.go

@@ -0,0 +1,28 @@
+package sgprotocgenopenapi
+
+import (
+	"context"
+	"os/exec"
+
+	"go.einride.tech/sage/sg"
+	"go.einride.tech/sage/sgtool"
+)
+
+// docs:
+// https://github.com/google/gnostic/tree/main/cmd/protoc-gen-openapi
+// https://buf.build/gnostic/gnostic/docs/main:gnostic.openapi.v3
+
+const (
+	version = "0.7.0"
+	name    = "protoc-gen-openapi"
+)
+
+func Command(ctx context.Context, args ...string) *exec.Cmd {
+	sg.Deps(ctx, PrepareCommand)
+	return sg.Command(ctx, sg.FromBinDir(name), args...)
+}
+
+func PrepareCommand(ctx context.Context) error {
+	_, err := sgtool.GoInstall(ctx, "github.com/google/gnostic/cmd/"+name, "v"+version)
+	return err
+}