disable nginx-shib and acmebot builds for now

.gitlab-ci.yml

@@ -26,6 +26,8 @@ adcli:
 nginx:
   stage: build
   script: scripts/nginx-shib.sh
+  only:
+    - master
   artifacts: 
     paths: 
       - packages/*
@@ -54,6 +56,8 @@ painintheapt:
 acmebot:
   stage: build
   script: scripts/acmebot.sh
+  only:
+    - master
   artifacts:
     paths:
       - packages/*