oci-image-tools: don't build for riscv64

Currently oci-image-tools has a do_compile error for riscv64. The
problem could be reproduced by:
    MACHINE=qemuriscv64 bitbake oci-image-tools

So explicitly set COMPATIBLE_HOST here to avoid it building for riscv64.
When someone interested in using this recipe for riscv64 fixes the
compile issue, this setting could be removed.

Also don't build packagegroup-container/packagegroup-kubernetes since
they depends on oci-image-tools

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-containers/oci-image-tools/oci-image-tools_git.bb

@@ -29,6 +29,8 @@ EXTRA_OEMAKE="BUILDTAGS=''"
 
 S = "${WORKDIR}/git/src/github.com/opencontainers/image-tools"
 
+COMPATIBLE_HOST:riscv64 = "null"
+
 do_compile() {
 	export GOARCH="${TARGET_GOARCH}"
 	export GOROOT="${STAGING_LIBDIR}/go"

recipes-core/packagegroups/packagegroup-container.bb

@@ -4,6 +4,8 @@ LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda
 
 inherit packagegroup
 
+COMPATIBLE_HOST:riscv64 = "null"
+
 PACKAGES = "\
     packagegroup-container \
     packagegroup-lxc \

recipes-core/packagegroups/packagegroup-kubernetes.bb

@@ -4,6 +4,8 @@ LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda
 
 inherit packagegroup
 
+COMPATIBLE_HOST:riscv64 = "null"
+
 # k3s has this restriction
 inherit features_check
 REQUIRED_DISTRO_FEATURES ?= "seccomp"