diff --git a/.github/workflows/ci-nimbus.yml b/.github/workflows/ci-nimbus.yml
index ac8e038..94b6164 100644
--- a/.github/workflows/ci-nimbus.yml
+++ b/.github/workflows/ci-nimbus.yml
@@ -3,6 +3,7 @@ on:
   push:
     paths:
     - atlas.lock
+    - .github/workflows/ci-nimbus.yml
 
 jobs:
   build:
diff --git a/Makefile b/Makefile
index fe7e9ae..7f018c4 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ LINK_PCRE := 0
 
 ifeq ($(NIM_PARAMS),)
 # "variables.mk" was not included, so we update the submodules.
-GIT_SUBMODULE_UPDATE := nimble install https://github.com/elcritch/atlas && atlas rep atlas.lock
+GIT_SUBMODULE_UPDATE := nimble install https://github.com/elcritch/atlas && atlas rep --noexec atlas.lock
 .DEFAULT:
 	+@ echo -e "Git submodules not found. Running '$(GIT_SUBMODULE_UPDATE)'.\n"; \
 		$(GIT_SUBMODULE_UPDATE); \
@@ -45,6 +45,11 @@ else # "variables.mk" was included. Business as usual until the end of this file
 
 # default target, because it's the first one that doesn't start with '.'
 
+# Builds the codex binary
+all: | build deps
+	echo -e $(BUILD_MSG) "$@" && \
+		$(ENV_SCRIPT) nim test $(NIM_PARAMS)
+
 # must be included after the default target
 -include $(BUILD_SYSTEM_DIR)/makefiles/targets.mk