Merge pull request 'feat: source environment vars from vault' (#1) from neoloc/environment_vars into master

Reviewed-on: https://git.query.consul/unkin/packer-images/pulls/1

Makefile

@@ -29,6 +29,11 @@ list:
 $(DIRS):
 	@echo "Building for $@"
 
+	# Export environment
+	@for kv in $$(vault kv get -format=json kv/service/packer/builder/env | jq -r '.data.data | to_entries[] | "\(.key)=\(.value)"'); do \
+		export "$kv"; \
+	done
+
 	# Check if on master branch
 	@if [ "$(BRANCH)" = "master" ]; then \
 		echo "Current branch is $(BRANCH), checking latest timestamp in consul."; \