Update fly.io instructions in readme [skip ci] (#936)

Add instruction on fixing the fly.toml before deploying
benbusby · Jan 24, 2023 · 026714b · 026714b
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diff --git a/README.md b/README.md
@@ -112,6 +112,9 @@ flyctl auth login
 flyctl launch --image benbusby/whoogle-search:latest
 ```
 
+The first deploy won't succeed because the default `internal_port` is wrong.
+To fix this, open the generated `fly.toml` file, set `services.internal_port` to `5000` and run `flyctl launch` again.
+
 Your app is now available at `https://<app-name>.fly.dev`.
 
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