Add Github Action to build RPM (#14)

* Update SPEC file

* Add clean target to Makefile

* add rpmbuild action

* Add missing build dependency

* Fix package name of golang for CentOS8

* Change outputs

* Fix file list and build requires

* Fix for file list

* Also upload SRPM

Makefile

@@ -4,10 +4,17 @@ all: $(APP)
 
 $(APP): metric-collector.go
 	make -C collectors
+	go get
 	go build -o $(APP) metric-collector.go
 
+clean:
+	make -C collectors clean
+	rm -f $(APP)
+
 fmt:
 	go fmt collectors/*.go
 	go fmt sinks/*.go
 	go fmt receivers/*.go
 	go fmt metric-collector.go
+
+.PHONY: clean