tests: Set GIT_CONFIG_GLOBAL=/dev/null for tests run via make test

This ensures that no host specific git configuration is pulled in while
testing. One such example would be "init.defaultBranch" which is set to
"main" on some hosts, which then causes tests to fail as they keep looking
for "master" branches.

Signed-off-by: Alexander Block <[email protected]>

Author: codablock

Makefile

@@ -96,6 +96,7 @@ build: check-deps $(LIBGIT2) ## Build manager binary
 KUBEBUILDER_ASSETS?="$(shell $(ENVTEST) --arch=$(ENVTEST_ARCH) use -i $(ENVTEST_KUBERNETES_VERSION) --bin-dir=$(ENVTEST_ASSETS_DIR) -p path)"
 test: $(LIBGIT2) install-envtest test-api check-deps ## Run tests
 	KUBEBUILDER_ASSETS=$(KUBEBUILDER_ASSETS) \
+	GIT_CONFIG_GLOBAL=/dev/null \
 	go test $(GO_STATIC_FLAGS) ./... -coverprofile cover.out
 
 check-deps:
@@ -268,3 +269,4 @@ env: $(LIBGIT2)
 	echo 'CGO_CFLAGS="$(CGO_CFLAGS)"' >> $(BUILD_DIR)/.env
 	echo 'CGO_LDFLAGS="$(CGO_LDFLAGS)"' >> $(BUILD_DIR)/.env
 	echo 'KUBEBUILDER_ASSETS=$(KUBEBUILDER_ASSETS)' >> $(BUILD_DIR)/.env
+	echo 'GIT_CONFIG_GLOBAL=/dev/null' >> $(BUILD_DIR)/.env