Add basic build machinery for CI

.gitmodules

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+[submodule "build"]
+	path = build
+	url = https://github.com/upbound/build

Makefile

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+# Project Setup
+PROJECT_NAME := configuration-caas
+PROJECT_REPO := github.com/upbound/$(PROJECT_NAME)
+
+# NOTE(hasheddan): the platform is insignificant here as Configuration package
+# images are not architecture-specific. We constrain to one platform to avoid
+# needlessly pushing a multi-arch image.
+PLATFORMS ?= linux_amd64
+-include build/makelib/common.mk
+
+# ====================================================================================
+# Setup Kubernetes tools
+
+UP_VERSION = v0.18.0
+UP_CHANNEL = stable
+UPTEST_VERSION = v0.2.1
+
+-include build/makelib/k8s_tools.mk
+# ====================================================================================
+# Setup XPKG
+
+# NOTE(jastang): Configurations deployed in Upbound do not currently follow
+# certain conventions such as the default examples root or package directory.
+XPKG_DIR = $(shell pwd)
+XPKG_EXAMPLES_DIR = .up/examples
+
+XPKG_REG_ORGS ?= xpkg.upbound.io/upbound
+# NOTE(hasheddan): skip promoting on xpkg.upbound.io as channel tags are
+# inferred.
+XPKG_REG_ORGS_NO_PROMOTE ?= xpkg.upbound.io/upbound
+XPKGS = $(PROJECT_NAME)
+-include build/makelib/xpkg.mk
+
+-include build/makelib/local.xpkg.mk
+-include build/makelib/controlplane.mk
+
+# ====================================================================================
+# Targets
+
+# run `make help` to see the targets and options
+
+# We want submodules to be set up the first time `make` is run.
+# We manage the build/ folder and its Makefiles as a submodule.
+# The first time `make` is run, the includes of build/*.mk files will
+# all fail, and this target will be run. The next time, the default as defined
+# by the includes will be run instead.
+fallthrough: submodules
+	@echo Initial setup complete. Running make again . . .
+	@make
+
+# Update the submodules, such as the common build scripts.
+submodules:
+	@git submodule sync
+	@git submodule update --init --recursive
+
+# We must ensure up is installed in tool cache prior to build as including the k8s_tools machinery prior to the xpkg
+# machinery sets UP to point to tool cache.
+build.init: $(UP)