osbuild-pipeline: add tool to print pipelines to stdout

This tool outputs the pipeline associated with each output type. In
the future this should grow to take a blueprint as an input, and
also allow the arch/os/version/variant to be configured.

Signed-off-by: Tom Gundersen <teg@jklm.no>

cmd/osbuild-pipeline/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"os"
+	"osbuild-composer/internal/blueprint"
+)
+
+func main() {
+	var format string
+	flag.StringVar(&format, "output-format", "qcow2", "output format")
+	flag.Parse()
+
+	blueprint := &blueprint.Blueprint{}
+	pipeline, err := blueprint.ToPipeline(format)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	bytes, err := json.Marshal(pipeline)
+	if err != nil {
+		panic("could not marshal pipeline into JSON")
+	}
+
+	os.Stdout.Write(bytes)
+}