Add cache volumes for validatepr builds

This speeds up the build a lot (10x), the second time.

Also add --init, so that it is possible to cancel it.

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Makefile

@@ -332,8 +332,12 @@ validate: validate-source validate-binaries
 # image in the future.
 .PHONY: validatepr
 validatepr: ## Go Format and lint, which all code changes must pass
-	$(PODMANCMD) run --rm \
+	$(PODMANCMD) run --rm --init --tmpfs /tmp \
 		-v $(CURDIR):/go/src/github.com/containers/podman \
+		-v validatepr-gocache:/root/.cache/go-build \
+		-v validatepr-gomodcache:/root/go/pkg/mod \
+		-v validatepr-lintcache:/root/.cache/golangci-lint \
+		-v validatepr-precommitcache:/root/.cache/pre-commit \
 		--security-opt label=disable \
 		--network=host \
 		-it \