Update ruby Docker tag to v3

renovate-bot · renovate-bot · commit f81a68ec67df · 2021-05-09T22:59:37.000Z
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7-alpine
+FROM ruby:3.0-alpine
 
 WORKDIR /app
 
