create fly.io apps file

Dockerfile

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+FROM node:alpine
+ADD package.json .
+RUN npm i
+ADD index.js .
+CMD ["npm","start"]

fly.toml

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+app = "http-echo"
+
+
+[[services]]
+  internal_port = 8080
+  protocol = "tcp"
+
+  [services.concurrency]
+    hard_limit = 25
+    soft_limit = 20
+
+  [[services.ports]]
+    handlers = ["http"]
+    port = "80"
+
+  [[services.ports]]
+    handlers = ["tls", "http"]
+    port = "443"
+
+  [[services.tcp_checks]]
+    interval = 10000
+    timeout = 2000