demo: add a sample container that just contains curl

This is useful for demonstrating how entry points and functionality
can be delivered in containers

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-demo/images/app-container-curl.bb

@@ -0,0 +1,46 @@
+SUMMARY = "Curl Application container image"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+IMAGE_FSTYPES = "container oci"
+inherit image
+inherit image-oci
+
+IMAGE_FEATURES = ""
+IMAGE_LINGUAS = ""
+NO_RECOMMENDATIONS = "1"
+
+IMAGE_INSTALL = " \
+       base-files \
+       base-passwd \
+       netbase \
+       ${CONTAINER_SHELL} \
+"
+
+# If the following is configured in local.conf (or the distro):
+#      PACKAGE_EXTRA_ARCHS:append = " container-dummy-provides"
+# 
+# it has been explicitly # indicated that we don't want or need a shell, so we'll
+# add the dummy provides.
+# 
+# This is required, since there are postinstall scripts in base-files and base-passwd
+# that reference /bin/sh and we'll get a rootfs error if there's no shell or no dummy
+# provider.
+CONTAINER_SHELL ?= "${@bb.utils.contains('PACKAGE_EXTRA_ARCHS', 'container-dummy-provides', 'container-dummy-provides', 'busybox', d)}"
+
+# Allow build with or without a specific kernel
+IMAGE_CONTAINER_NO_DUMMY = "1"
+
+# Workaround /var/volatile for now
+ROOTFS_POSTPROCESS_COMMAND += "rootfs_fixup_var_volatile ; "
+rootfs_fixup_var_volatile () {
+    install -m 1777 -d ${IMAGE_ROOTFS}/${localstatedir}/volatile/tmp
+    install -m 755 -d ${IMAGE_ROOTFS}/${localstatedir}/volatile/log
+}
+
+OCI_IMAGE_ENTRYPOINT = "curl"
+OCI_IMAGE_TAG = "easy"
+OCI_IMAGE_ENTRYPOINT_ARGS = "http://localhost:80"
+CONTAINER_SHELL = "busybox"
+
+IMAGE_INSTALL:append = "curl"