Fixing nassella-in-production bugs.

Makefile

@@ -19,6 +19,12 @@ TERRAFORM_ENV := production
 config_dir := ./config/
 apps_config := $(config_dir)apps.config
 
+BUTANE := butane -d ${PWD}
+
+ifeq ($(shell command -v docker >/dev/null 2>&1 && echo yes),yes)
+	BUTANE := docker run --rm --volume ${PWD}:/pwd --workdir /pwd -i quay.io/coreos/butane:latest -d /pwd
+endif
+
 IMAGE_DEPS :=
 
 COMPOSE_ENVS := $(shell if [ -d app/ ]; then find app/ -type f -name '.compose-env'; fi)
@@ -84,7 +90,7 @@ restic-scheduled-snapshot.sh \
 app/.env \
 $(config_dir)ssh-keys \
 app.tar.gz
-	cat cl.yaml | docker run --rm --volume $(config_dir)/ssh-keys:/pwd/ssh-keys --volume ${PWD}:/pwd --workdir /pwd -i quay.io/coreos/butane:latest -d /pwd > ignition.json
+	cat cl.yaml | $(BUTANE) > ignition.json
 
 generated.tfvars: $(apps_config) make-generated.sh
 	./make-generated.sh $(apps_config) > generated.tfvars