add go.lint.analysiskey make target for caching linters

Signed-off-by: Erhan Cagirici <[email protected]>

Makefile

@@ -374,6 +374,13 @@ load-pkg: $(UP) build.all
 
 	@$(OK) Loaded the family providers into the Docker daemon: $(SUBPACKAGES)
 
+go.lint.analysiskey-interval:
+	@# cache is invalidated at least every 7 days
+	@echo -n golangci-lint.cache-$$(( $$(date +%s) / (7 * 86400) ))-
+
+go.lint.analysiskey:
+	@echo $$(make go.lint.analysiskey-interval)$$(sha1sum go.sum | cut -d' ' -f1)
+
 .PHONY: cobertura reviewable submodules fallthrough go.mod.cachedir go.cachedir run crds.clean $(TERRAFORM_PROVIDER_SCHEMA) load-pkg
 
 build.init: kustomize-crds