Makefile: add a checks rule

The checks rule can be run to perform some checks on the docs.
For now it only includes running the check-glossaries script.

This rule should only run basic checks or should not prevent the user
from building the docs in case of failure.

This rule can be used in the future to run additional checks on the
documentation.

(From yocto-docs rev: 1d9a4a52fa9f2e2eb7f282324f85a46b28128fbf)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/Makefile

@@ -24,9 +24,9 @@ endif
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
-.PHONY: all help Makefile clean stylecheck publish epub latexpdf
+.PHONY: all checks help Makefile clean stylecheck publish epub latexpdf
 
-publish: Makefile epub latexpdf html singlehtml
+publish: Makefile checks epub latexpdf html singlehtml
 	rm -rf $(BUILDDIR)/$(DESTDIR)/
 	mkdir -p $(BUILDDIR)/$(DESTDIR)/
 	cp -r $(BUILDDIR)/html/* $(BUILDDIR)/$(DESTDIR)/
@@ -52,6 +52,9 @@ PNGs := $(foreach dir, $(IMAGEDIRS), $(patsubst %.svg,%.png,$(wildcard $(SOURCED
 clean:
 	@rm -rf $(BUILDDIR) $(PNGs) $(PDFs) poky.yaml sphinx-static/switchers.js releases.rst
 
+checks:
+	$(SOURCEDIR)/tools/check-glossaries --docs-dir $(SOURCEDIR)
+
 stylecheck:
 	vale sync
 	vale $(VALEOPTS) $(VALEDOCS)