distro/rhel8: add preliminary support for ppc64le and s390x

This adds placeholder architecture structs, but no image types are
hooked up.

This will allow osbuild-composer to run on these architectures, and
serve the weldr API, but without support for building any images.

Image type support will be added in the future.

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

internal/distro/rhel8/distro.go

@@ -844,7 +844,17 @@ func New() distro.Distro {
 		openstackImgType,
 	)
 
-	r.setArches(x8664, aarch64)
+	ppc64le := architecture{
+		distro: &r,
+		name:   "ppc64le",
+	}
+
+	s390x := architecture{
+		distro: &r,
+		name:   "s390x",
+	}
+
+	r.setArches(x8664, aarch64, ppc64le, s390x)
 
 	return &r
 }

internal/distro/rhel8/distro_test.go

@@ -103,6 +103,8 @@ func TestImageType_BuildPackages(t *testing.T) {
 	buildPackages := map[string][]string{
 		"x86_64":  x8664BuildPackages,
 		"aarch64": aarch64BuildPackages,
+		"ppc64le": nil,
+		"s390x":   nil,
 	}
 	d := rhel8.New()
 	for _, archLabel := range d.ListArches() {
@@ -144,6 +146,12 @@ func TestImageType_Name(t *testing.T) {
 				"openstack",
 			},
 		},
+		{
+			arch: "ppc64le",
+		},
+		{
+			arch: "s390x",
+		},
 	}
 	for _, mapping := range imgMap {
 		arch, err := distro.GetArch(mapping.arch)
@@ -328,7 +336,7 @@ func TestDistro_Manifest(t *testing.T) {
 func TestRhel8_ListArches(t *testing.T) {
 	distro := rhel8.New()
 	arches := distro.ListArches()
-	assert.Equal(t, []string{"aarch64", "x86_64"}, arches)
+	assert.Equal(t, []string{"aarch64", "ppc64le", "s390x", "x86_64"}, arches)
 }
 
 func TestRhel8_GetArch(t *testing.T) {
@@ -343,6 +351,12 @@ func TestRhel8_GetArch(t *testing.T) {
 		{
 			name: "aarch64",
 		},
+		{
+			name: "ppc64le",
+		},
+		{
+			name: "s390x",
+		},
 		{
 			name:          "foo-arch",
 			errorExpected: true,