add juicefs s3 gateway deployment readme on fly.io

deploy/fly-io/.gitignore

@@ -0,0 +1 @@
+.env

deploy/fly-io/README.md

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+# Deploy JuiceFS S3 Gateway on fly.io
+
+JuiceFS S3 Gateway is MinIO backed by a JuiceFS mount. There are two main reasons you may want this.
+
+1. To browse files managed with JuiceFS using a web client in this case MinIO
+1. To use multipart uploads and range downloads in order to get the most of your bandwidth
+
+## Deploying the gateway
+
+### Prepare your secrets
+
+The app will need a few secrets. Take a look at [start.sh](./start.sh) to see what's available. Here's how you can create this.
+
+```shell
+cat <<'EOF' | tee > .env
+TAILSCALE_AUTHKEY="my-tailscale-authkey"
+JUICEFS_NAME="my-filesystem"
+JUICEFS_REDIS_URI="rediss://username:password@hostname:6379/0"
+JUICEFS_BUCKET="https://fly.storage.tigris.dev/my-bucket-name"
+JUICEFS_ACCESS_KEY="my-access-key"
+JUICEFS_SECRET_KEY="my-secret-key"
+MINIO_ROOT_USER="my-username"
+MINIO_ROOT_PASSWORD="my-password"
+EOF
+```
+
+### Launch and deploy the fly app
+
+This will modify the [fly.toml](./fly.toml) file in-place. It will also prompt you to confirm the configuration.
+
+```shell
+fly launch --org my-org --name my-deployment --no-deploy --copy-config --yes
+```
+
+This will import the secrets you created earlier, deploy the app, and scale it to 1 instance.
+
+```shell
+cat .env | fly secrets import
+fly deploy
+fly scale count 1 --max-per-region=1 --region=iad
+```
+
+# Deleting the deployment
+
+```shell
+fly app destroy --yes my-deployment
+```

deploy/fly-io/fly.toml

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-app = 'data-stage-beam-cloud'
+# fly.toml app configuration file generated for my-deployment on 2025-01-09T10:06:05-05:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = 'my-deployment'
 primary_region = 'iad'
 kill_signal = 'SIGTERM'
 
@@ -13,8 +18,8 @@ kill_signal = 'SIGTERM'
 [http_service]
   internal_port = 9000
   force_https = true
-  auto_start_machines = true
   auto_stop_machines = 'off'
+  auto_start_machines = true
 
   [http_service.concurrency]
     type = 'requests'
@@ -42,6 +47,6 @@ kill_signal = 'SIGTERM'
     path = '/minio/health/live'
 
 [[vm]]
-  cpus = 2
-  cpu_kind = 'shared'
   memory = '2gb'
+  cpu_kind = 'shared'
+  cpus = 2