Makefile: Remove test dependency on docker-build

Prevent running the tests twice in e2e workflow by removing the
dependency on docker-build on test.
Update e2e workflow to remove setting KUBEBUILDER_ASSETS needed to run
tests from "Build container image" step.

Signed-off-by: Sunny <darkowlzz@protonmail.com>

.github/workflows/e2e.yaml

@@ -71,8 +71,6 @@ jobs:
             BUILD_PLATFORMS=linux/amd64 \
             BUILD_ARGS="--cache-from=type=local,src=/tmp/.buildx-cache \
               --cache-to=type=local,dest=/tmp/.buildx-cache-new,mode=max"
-        env:
-          KUBEBUILDER_ASSETS: ${{ github.workspace }}/kubebuilder/bin
       - # Temp fix
         # https://github.com/docker/build-push-action/issues/252
         # https://github.com/moby/buildkit/issues/1896

Makefile

@@ -86,7 +86,7 @@ generate: controller-gen
 	cd api; $(CONTROLLER_GEN) object:headerFile="../hack/boilerplate.go.txt" paths="./..."
 
 # Build the docker image
-docker-build: test
+docker-build:
 	docker buildx build \
 	--platform=$(BUILD_PLATFORMS) \
 	-t ${IMG} \