Merge pull request #2946 from znz/imporove-compose.yaml

Improve Dockerfile and compose.yaml

Author: znz

compose.yaml

@@ -2,17 +2,22 @@
 #
 # docker compose build
 # docker compose run --rm rurema rake -T
-# docker compose run --rm rurema rake generate:2.7.0 statichtml:2.7.0
-# open _site/2.7.0/index.html instead of /tmp/html/2.7.0/index.html
+# docker compose run --rm rurema rake generate:3.4 statichtml:3.4
+# open _site/3.4/index.html instead of /tmp/html/3.4/index.html
 services:
   rurema:
-    build: .
+    build:
+      context: .
     volumes:
       - ..:/workspaces:cached
       - "./_site:/tmp/html/"
+      - "bundle_cache:/usr/local/bundle"
   web:
     image: nginx
     ports:
-    - "8080:80"
+      - "8080:80"
     volumes:
-    - "./_site:/usr/share/nginx/html:ro"
+      - "./_site:/usr/share/nginx/html:ro"
+
+volumes:
+  bundle_cache: