chore(make): Split and enhancements

- split Makefile in several sub files
- use a separated container for tests
-

makefiles/gpg.mk

@@ -0,0 +1,33 @@
+## GPG signing
+
+gpg-sign:
+	rm -f dist/*.asc
+	$(MAKE) $(ASC_BINARIES)
+
+check-sign:
+	@echo "=> Checking signatures..."
+	@for f in $(ASC_BINARIES); do \
+		if gpg --verify $$f &>/dev/null; then \
+			echo "Signature for $$f is valid"; \
+		else \
+			echo "Signature for $$f is invalid"; \
+			exit 1; \
+		fi; \
+	done
+	@echo "=> checking in blank environment..."
+	keyid=$(shell gpg -k --with-colons $(SIGNER)| grep '^pub' | cut -d: -f5);
+	$(CTN) run --rm -it -e GPGKEY=$${keyid} -v ./dist:/opt/dist:z \
+		packaging:fedora \
+		bash -c '
+		gpg --recv-key $$GPGKEY || exit 1;
+		echo "Trusting $(SIGNER) key...";
+		echo "trusted-key 483493B2DD0845DA8F21A26DF3702E3FAD8F76DC" >> ~/.gnupg/gpg.conf;
+		gpg --update-trustdb;
+		rm -f ~/.gnupg/gpg.conf;
+		for f in /opt/dist/*.asc; do echo "==> $${f}"; gpg --verify $${f}; done;
+		echo "=> Listing imported keys...";
+		gpg -k
+		'
+
+dist/%.asc: dist/%
+	gpg --armor --detach-sign  --default-key $(SIGNER) $< &>/dev/null || exit 1