Remove shell build script and replaced it with a Makefile.

Makefile

@@ -0,0 +1,21 @@
+# Makefile for building testver
+
+# Get version from git tags
+VERSION := $(shell git describe --tags --always 2>/dev/null)
+
+# Default target
+.PHONY: testver clean
+
+testver:
+ifneq ($(VERSION),)
+	@echo "Building version: $(VERSION)"
+	go build -o testver -ldflags "-X main.Version=$(VERSION)"
+else
+	@echo "Building without version information"
+	go build -o testver .
+endif
+
+clean:
+	rm -f testver
+
+.DEFAULT_GOAL := testver