feat: add build workflows

- enable fetch-depth for code_checkout
- fetch master branch before checking for changed files
- ensure the clean target is called with the default
- improve makefile failure handling
- ensure VAULT_ADDR is set before VAULT_TOKEN

Makefile

@@ -40,9 +40,11 @@ $(DIRS):
 
 	# Export environment
 	export VAULT_ADDR=https://vault.query.consul:8200
-	@export VAULT_TOKEN=$$(vault write -field=token auth/approle/login role_id=$$VAULT_ROLEID) && \
+	export VAULT_TOKEN=$$(vault write -field=token auth/approle/login role_id=$$VAULT_ROLEID) && \
 	eval $$(vault kv get -format=json kv/service/packer/builder/env | jq -r '.data.data | to_entries[] | "export \(.key)=\(.value)"')
 
+	@echo "Environment retrieved for $@"
+
 	# Check if on master branch
 	@if [ "$(GIT_BRANCH)" = "master" ]; then \
 		echo "Current branch is $(GIT_BRANCH), checking latest timestamp in consul."; \