fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/api/node_modules/undefsafe/.travis.yml

@@ -0,0 +1,18 @@
+sudo: false
+language: node_js
+cache:
+  directories:
+    - node_modules
+notifications:
+  email: false
+node_js:
+  - '4'
+before_install:
+  - npm i -g npm@^2.0.0
+before_script:
+  - npm prune
+after_success:
+  - npm run semantic-release
+branches:
+  except:
+    - "/^v\\d+\\.\\d+\\.\\d+$/"