[PATCH 1/3] testsuite: add rootfs target for rootfs only tests

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

As a preparation to speedup the testsuite, we add a rootfs recipe that
behaves similar to the image recipe, however does not carry a initrd or
a kernel which avoids the huge emulation overhead on non native
architectures. This recipe also can be used to check rootfs features
independently.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta-test/recipes-core/images/isar-rootfs-ci.bb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 meta-test/recipes-core/images/isar-rootfs-ci.bb

diff --git a/meta-test/recipes-core/images/isar-rootfs-ci.bb b/meta-test/recipes-core/images/isar-rootfs-ci.bb
new file mode 100644
index 00000000..a87fd1a8
--- /dev/null
+++ b/meta-test/recipes-core/images/isar-rootfs-ci.bb
@@ -0,0 +1,17 @@
+# CI root filesystem for target installation (without kernel, initrd, ...)
+#
+# This software is a part of ISAR.
+# Copyright (C) 2025 Siemens
+
+# Bill-of-material
+ROOTFS_MANIFEST_DEPLOY_DIR = "${DEPLOY_DIR_IMAGE}"
+
+ROOTFSDIR = "${WORKDIR}/rootfs"
+ROOTFS_FEATURES = "generate-sbom"
+
+inherit multiarch
+inherit rootfs
+
+# behave similar to image class, so we can reuse the testing infrastructure
+DEPENDS += "${IMAGE_INSTALL}"
+ROOTFS_PACKAGES += "${IMAGE_PREINSTALL} ${@isar_multiarch_packages('IMAGE_INSTALL', d)}"
-- 
2.51.0

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