use uuid to invalidate cache

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

docker-bake.hcl

@@ -90,16 +90,12 @@ target "update-vendor" {
     output = ["."]
 }
 
-// Used to invalidate cache for mod-outdated run stage
-// See also https://github.com/moby/buildkit/issues/1213
-variable "TIMESTAMP" {
-    default = ""
-}
 target "mod-outdated" {
     dockerfile = "./dockerfiles/Dockerfile.vendor"
     target = "outdated"
     args = {
-        TIMESTAMP = TIMESTAMP
+        // used to invalidate cache (more info https://github.com/moby/buildkit/issues/1213)
+        UUID = uuidv4()
     }
     output = ["type=cacheonly"]
 }

docker.Makefile

@@ -20,7 +20,6 @@ ifeq ($(DOCKER_CLI_GO_BUILD_CACHE),y)
 DOCKER_CLI_MOUNTS += -v "$(CACHE_VOLUME_NAME):/root/.cache/go-build"
 endif
 VERSION = $(shell cat VERSION)
-TIMESTAMP = $(shell date '+%s')
 ENVVARS = -e VERSION=$(VERSION) -e GITCOMMIT -e PLATFORM -e TESTFLAGS -e TESTDIRS -e GOOS -e GOARCH -e GOARM -e TEST_ENGINE_VERSION=$(E2E_ENGINE_VERSION)
 
 # Some Dockerfiles use features that are only supported with BuildKit enabled
@@ -94,7 +93,7 @@ validate-vendor: ## validate vendor
 
 .PHONY: mod-outdated
 mod-outdated: ## check outdated dependencies
-	TIMESTAMP=$(TIMESTAMP) docker buildx bake mod-outdated
+	docker buildx bake mod-outdated
 
 .PHONY: authors
 authors: ## generate AUTHORS file from git history

dockerfiles/Dockerfile.vendor

@@ -34,7 +34,7 @@ EOT
 
 FROM psampaz/go-mod-outdated:${MODOUTDATED_VERSION} AS go-mod-outdated
 FROM base AS outdated
-ARG TIMESTAMP
+ARG UUID
 RUN --mount=target=.,rw \
     --mount=target=/go/pkg/mod,type=cache \
     --mount=from=go-mod-outdated,source=/home/go-mod-outdated,target=/usr/bin/go-mod-outdated \