Add build submodule

Signed-off-by: Jean du Plessis <[email protected]>

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "build"]
+	path = build
+	url = https://github.com/crossplane/build

Makefile

@@ -0,0 +1,69 @@
+# Project Setup
+PROJECT_NAME := provider-workflows
+PROJECT_REPO := github.com/crossplane-contrib/$(PROJECT_NAME)
+
+PLATFORMS ?= linux_amd64 linux_arm64 darwin_amd64 darwin_arm64
+
+# -include will silently skip missing files, which allows us
+# to load those files with a target in the Makefile. If only
+# "include" was used, the make command would fail and refuse
+# to run a target until the include commands succeeded.
+-include build/makelib/common.mk
+
+# ====================================================================================
+# Setup Output
+S3_BUCKET ?= $(PROJECT_NAME).releases
+-include build/makelib/output.mk
+
+# ====================================================================================
+# Setup Go
+GO_REQUIRED_VERSION = 1.23
+# GOLANGCILINT_VERSION is inherited from build submodule by default.
+# Uncomment below if you need to override the version.
+# GOLANGCILINT_VERSION ?= 1.61.0
+
+GO_STATIC_PACKAGES = $(GO_PROJECT)/cmd/crddiff $(GO_PROJECT)/cmd/buildtagger $(GO_PROJECT)/cmd/updoc $(GO_PROJECT)/cmd/ttr $(GO_PROJECT)/cmd/perf $(GO_PROJECT)/cmd/linter/lint-provider-family
+GO_LDFLAGS += -X $(GO_PROJECT)/internal/version.Version=$(VERSION)
+GO_SUBDIRS += cmd internal
+GO111MODULE = on
+-include build/makelib/golang.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
+
+.PHONY: submodules fallthrough
+
+-include build/makelib/k8s_tools.mk
+-include build/makelib/controlplane.mk
+
+uptest:
+	@echo "Running Uptest"
+	@printenv
+
+# NOTE(hasheddan): the build submodule currently overrides XDG_CACHE_HOME in
+# order to force the Helm 3 to use the .work/helm directory. This causes Go on
+# Linux machines to use that directory as the build cache as well. We should
+# adjust this behavior in the build submodule because it is also causing Linux
+# users to duplicate their build cache, but for now we just make it easier to
+# identify its location in CI so that we cache between builds.
+go.cachedir:
+	@go env GOCACHE
+
+go.mod.cachedir:
+	@go env GOMODCACHE