Add Grafana, AlertManager, vmutils

The *vmutils* package can be built from source easily, as its just a
collection of Go applications.  Grafana and Alertmanager are quite a bit
more complicated because of their respective browser applications.  In
the interest of getting this project actually going, we'll just install
the official binary releases of these (for now?).

package/grafana/Config.in

@@ -0,0 +1,5 @@
+config BR2_PACKAGE_GRAFANA
+	bool "grafana"
+	help
+	  Grafana
+

package/grafana/grafana.hash

@@ -0,0 +1 @@
+sha256 2046f8e9c0b659d0e67f57d8a311ba714214e9616a41ffaba71c256d42914977 grafana-9.0.1.linux-arm64.tar.gz

package/grafana/grafana.mk

@@ -0,0 +1,37 @@
+###############################################################################
+#
+# Grafana
+#
+# Building Grafana is quite complicated, so we'll just install from the binary
+# package for now.
+###############################################################################
+
+GRAFANA_VERSION = 9.0.1
+GRAFANA_SOURCE = grafana-$(GRAFANA_VERSION).linux-$(KERNEL_ARCH).tar.gz
+GRAFANA_SITE = https://dl.grafana.com/oss/release
+GRAFANA_LICENSE = Apache-2.0
+GRAFANA_LICENSE_FILES = LICENSE
+
+GRAFANA_INSTALL_TARGET = YES
+
+define GRAFANA_INSTALL_TARGET_CMDS
+	$(INSTALL) -m u=rwx,go=rx $(@D)/bin/grafana-cli $(TARGET_DIR)/usr/sbin
+	$(INSTALL) -m u=rwx,go=rx $(@D)/bin/grafana-server $(TARGET_DIR)/usr/sbin
+	$(INSTALL) -d $(TARGET_DIR)/usr/share/grafana
+	cp -a \
+		$(@D)/conf \
+		$(@D)/plugins-bundled \
+		$(@D)/public \
+		$(@D)/scripts \
+		$(@D)/LICENSE \
+		$(@D)/NOTICE.md \
+		$(@D)/README.md \
+		$(@D)/VERSION \
+		$(TARGET_DIR)/usr/share/grafana/
+endef
+
+define GRAFANA_USERS
+	grafana -1 grafana -1 * /usr/share/grafana /sbin/nologin - grafana user account
+endef
+
+$(eval $(generic-package))