makefile: add task to generate buildx YAML docs from remote definition

Signed-off-by: CrazyMax <[email protected]>

Author: crazy-max

Makefile

@@ -0,0 +1,21 @@
+ifneq (, $(BUILDX_BIN))
+	export BUILDX_CMD = $(BUILDX_BIN)
+else ifneq (, $(shell docker buildx version))
+	export BUILDX_CMD = docker buildx
+else ifneq (, $(shell which buildx))
+	export BUILDX_CMD = $(which buildx)
+else
+	$(error "Buildx is required: https://github.com/docker/buildx#installing")
+endif
+
+BUILDX_REPO ?= https://github.com/docker/buildx.git
+BUILDX_REF ?= master
+
+# Generate YAML docs from remote bake definition
+# Usage BUILDX_REF=v0.7.0 make buildx-yaml
+buildx-yaml:
+	$(eval $@_TMP_OUT := $(shell mktemp -d -t docs-output.XXXXXXXXXX))
+	DOCS_FORMATS=yaml $(BUILDX_CMD) bake --set "*.output=$($@_TMP_OUT)" "$(BUILDX_REPO)#$(BUILDX_REF)" update-docs
+	rm -rf ./_data/buildx/*
+	cp -R "$($@_TMP_OUT)"/out/reference/*.yaml ./_data/buildx/
+	rm -rf $($@_TMP_OUT)/*