main: workaround issue with mirrorIDs

This commit adds a workaround for the librepo mirror IDs:

osbuild librepo expects the mirrors to be encoded as
hex-digests - osbuild-depsolve-dnf gives us this for some
repos but when using "SetRootDir" (as we do here) it just gives
us the pipeline names, we probably want to fix this either
in osbuild:librepo (relaxing the rules) or "images" (always
hash the id again) but for now to it here to get some testing.

bib/cmd/bootc-image-builder/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -148,6 +149,23 @@ func makeManifest(c *ManifestConfig, solver *dnfjson.Solver, cacheRoot string) (
 		containerSpecs[plName] = specs
 	}
 
+	// HACK: osbuild librepo expects the mirrors to be encoded as
+	// hex-digests - osbuild-depsolve-dnf gives us this for some
+	// repos but when using "SetRootDir" (as we do here) it just gives
+	// us the pipeline names, we probably want to fix this either
+	// in osbuild:librepo (relaxing the rules) or "images" (always
+	// hash the id again) but for now to it here
+	for _, repoConf := range depsolvedRepos {
+		for idx := range repoConf {
+			repoConf[idx].Id = hex.EncodeToString([]byte(repoConf[idx].Id))
+		}
+	}
+	for _, pkgSet := range depsolvedSets {
+		for idx := range pkgSet {
+			pkgSet[idx].RepoID = hex.EncodeToString([]byte(pkgSet[idx].RepoID))
+		}
+	}
+
 	inputs := &manifest.Inputs{
 		PackageSets:    depsolvedSets,
 		ContainerSpecs: containerSpecs,