fix: let integration test use proper variable

Makefile

@@ -180,7 +180,7 @@ performance-test: ## Run performance tests
 	$(CONTAINER_CLITOOL) run -v ${PWD}:/home/nginx/$(CONTAINER_VOLUME_FLAGS) --rm nginx-agent-benchmark:1.0.0
 
 integration-test: local-deb-package
-	PACKAGE=${PACKAGE_NAME} DOCKER_IMAGE=${DOCKER_IMAGE} go test ./test/integration/api 
+	PACKAGE=${PACKAGE_NAME} BASE_IMAGE=${BASE_IMAGE} go test ./test/integration/api
 
 test-bench: ## Run benchmark tests
 	cd test/performance && GOWORK=off CGO_ENABLED=0 go test -mod=vendor -count 5 -timeout 2m -bench=. -benchmem metrics_test.go

scripts/docker/nginx-oss/ubuntu/Dockerfile

@@ -1,5 +1,5 @@
-ARG DOCKER_IMAGE
-FROM ${DOCKER_IMAGE} as install
+ARG BASE_IMAGE
+FROM ${BASE_IMAGE} as install
 LABEL maintainer="NGINX Agent Maintainers <[email protected]>"
 
 ARG PACKAGE

test/integration/api/api_test.go

@@ -34,7 +34,7 @@ func TestAPI_setupTestContainer(t *testing.T) {
 	assert.NoError(t, comp.
 		WaitForService("agent", wait.ForLog("OneTimeRegistration completed")).WithEnv(map[string]string{
 		"PACKAGE":      os.Getenv("PACKAGE"),
-		"DOCKER_IMAGE": os.Getenv("DOCKER_IMAGE"),
+		"BASE_IMAGE": os.Getenv("BASE_IMAGE"),
 	}).
 		Up(ctx, compose.Wait(true)), "compose.Up()")
 }

test/integration/api/docker-compose.yml

@@ -6,17 +6,16 @@ networks:
 
 services:
   agent:
-    build: 
+    build:
       context: ../../../
       dockerfile: ./scripts/docker/nginx-oss/ubuntu/Dockerfile
       args:
         PACKAGE: ${PACKAGE}
-        DOCKER_IMAGE: ${DOCKER_IMAGE}
+        BASE_IMAGE: ${BASE_IMAGE}
         AGENT_CONF: "./test/testdata/configs/integration/api/nginx-agent.conf"
         NGINX_CONF: "./test/testdata/configs/integration/api/nginx.conf"
         ENTRY_POINT: "./scripts/docker/nginx-oss/entrypoint.sh"
     ports:
       - 9091:9091
     networks:
       - monitoring
-