Add healthcheck

.github/workflows/docker.yml

@@ -49,8 +49,8 @@ jobs:
 
       - name: Check Health
         run: |
-          HEALTH_STATUS=$(docker inspect --format='{{.State.Status}}' rails-on-docker);
+          HEALTH_STATUS=$(docker inspect --format='{{.State.Health}}' rails-on-docker);
           echo "$HEALTH_STATUS"
-          if [ "$HEALTH_STATUS" != "running" ]; then
+          if [ "$HEALTH_STATUS" != "healthy" ]; then
             exit 1
           fi

production.Dockerfile

@@ -78,6 +78,9 @@ USER rails:rails
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint-production"]
 
+HEALTHCHECK --interval=5m --timeout=3s --start-period=30s \
+  CMD curl -f http://localhost:3000/up || exit 1
+
 # Start the server by default, this can be overwritten at runtime
 EXPOSE 3000
 CMD ["./bin/rails", "server"]