fix(envsubst): leave lines with '# nosubst' unchanged when substituting (used to be simply dropped)

Fixes #50

templates/gitlab-ci-k8s.yml

@@ -449,7 +449,11 @@ stages:
         }
         return enc
       }
-      !/# *nosubst/ {
+      /# *nosubst/ {
+        print $0
+        next
+      }
+      {
         orig_line = $0
         line = $0
         count_repl_in_line = 0