Test all manifests with depsolved package sets

Generated image test case manifests for all supported distros, arches and
image-types are being tested as part of distro unit tests. However due
to time constrains, the unit test does not depsolve the image's default
package sets and thus does not check if they changed in the internal
osbuild-composer's representation, compared to the generated image test
case.

Extend the `TestDistro_Manifest()` function used by the unit test to
allow depsolving image's package sets.

Introduce a new test case binary `osbuild-composer-manifest-tests`
allowing to check the manifests generated by composer for all supported
combinations of images against generated manifests, including depsolving
image's default package sets.

Introduce a new CI test case `manifest_tests.sh` executing the
`osbuild-composer-manifest-tests` binary and testing all existing image
test cases. Run it in CI on RHEL-9 runner.

Modify SPEC file to ship the newly added test case.

Signed-off-by: Tomas Hozza <thozza@redhat.com>

cmd/osbuild-composer-manifest-tests/main_test.go

@@ -0,0 +1,39 @@
+// +build integration
+
+package main
+
+import (
+	"flag"
+	"os"
+	"testing"
+
+	"github.com/osbuild/osbuild-composer/internal/distro/distro_test_common"
+	"github.com/osbuild/osbuild-composer/internal/distroregistry"
+	"github.com/stretchr/testify/require"
+)
+
+var manifestsPath string
+var dnfJsonPath string
+var testCaseGlob string
+
+func init() {
+	flag.StringVar(&manifestsPath, "manifests-path", "/usr/share/tests/osbuild-composer/manifests", "path to a directory with *.json files containing image test cases")
+	flag.StringVar(&dnfJsonPath, "dnf-json-path", "/usr/libexec/osbuild-composer/dnf-json", "path to the 'dnf-json' executable")
+	flag.StringVar(&testCaseGlob, "test-case-glob", "*", "glob pattern to select image test cases to verify")
+}
+
+func TestManifests(t *testing.T) {
+	cacheDirPath := "/var/tmp/osbuild-composer-manifest-tests/rpmmd"
+	err := os.MkdirAll(cacheDirPath, 0755)
+	require.Nilf(t, err, "failed to create RPMMD cache directory %q", cacheDirPath)
+
+	distro_test_common.TestDistro_Manifest(
+		t,
+		manifestsPath,
+		testCaseGlob,
+		distroregistry.NewDefault(),
+		true,
+		cacheDirPath,
+		dnfJsonPath,
+	)
+}