feat: setup deployment

- add drone.yml
- add makefile
- add spec file
- add vault intermediate/root ca files

Makefile

@@ -0,0 +1,18 @@
+.PHONY: all prepare build clean
+
+RPMBUILD := /drone/src/rpmbuild
+SPECFILE := internal-ca-certificates.spec
+
+# Extract the version from the spec file
+VERSION := $(shell grep "^Version:" $(SPECFILE) | awk '{print $$2}')
+
+all: build
+
+prepare:
+	mkdir -p $(RPMBUILD)/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
+
+build: prepare
+	rpmbuild -ba --define "_topdir $(RPMBUILD)" $(SPECFILE)
+
+clean:
+	rm -rf $(RPMBUILD)