s3: add Fastly Object Storage provider

- Add new Fastly provider with US East, US West, and EU Central regions
- Add `etag_is_not_md5` quirk for providers with mandatory encryption
- Disable server-side copy for Fastly (not supported)

docs/content/_index.md

@@ -133,6 +133,7 @@ WebDAV or S3, that work out of the box.)
 {{< provider name="Dropbox" home="https://www.dropbox.com/" config="/dropbox/" >}}
 {{< provider name="Enterprise File Fabric" home="https://storagemadeeasy.com/about/" config="/filefabric/" >}}
 {{< provider name="Exaba" home="https://exaba.com/" config="/s3/#exaba" >}}
+{{< provider name="Fastly Object Storage" home="https://www.fastly.com/products/storage" config="/s3/#fastly" >}}
 {{< provider name="Fastmail Files" home="https://www.fastmail.com/" config="/webdav/#fastmail-files" >}}
 {{< provider name="FileLu Cloud Storage" home="https://filelu.com/" config="/filelu/" >}}
 {{< provider name="FileLu S5 (S3-Compatible Object Storage)" home="https://s5lu.com/" config="/s3/#filelu-s5" >}}

docs/content/s3.md

@@ -23,6 +23,7 @@ The S3 backend can be used with a number of different providers:
 {{< provider name="DigitalOcean Spaces" home="https://www.digitalocean.com/products/object-storage/" config="/s3/#digitalocean-spaces" >}}
 {{< provider name="Dreamhost" home="https://www.dreamhost.com/cloud/storage/" config="/s3/#dreamhost" >}}
 {{< provider name="Exaba" home="https://exaba.com/" config="/s3/#exaba" >}}
+{{< provider name="Fastly Object Storage" home="https://www.fastly.com/products/storage" config="/s3/#fastly" >}}
 {{< provider name="FileLu S5 (S3-Compatible Object Storage)" home="https://s5lu.com/" config="/s3/#filelu-s5" >}}
 {{< provider name="GCS" home="https://cloud.google.com/storage/docs" config="/s3/#google-cloud-storage" >}}
 {{< provider name="Hetzner" home="https://www.hetzner.com/storage/object-storage/" config="/s3/#hetzner" >}}
@@ -5279,6 +5280,92 @@ secret_access_key = XXX
 endpoint = http://127.0.0.1:9000/
 ```
 
+### Fastly Object Storage {#fastly}
+
+[Fastly Object Storage](https://www.fastly.com/products/storage) is an
+S3-compatible object storage service from Fastly. It provides three
+regions (US East, US West, and EU Central) with mandatory server-side
+encryption.
+
+Here is an example of making a configuration. First run:
+
+```console
+rclone config
+```
+
+This will guide you through an interactive setup process.
+
+```text
+No remotes found, make a new one?
+n) New remote
+s) Set configuration password
+q) Quit config
+n/s/q> n
+
+Enter name for new remote.
+name> fastly
+
+Option Storage.
+Type of storage to configure.
+Storage> s3
+
+Option provider.
+Choose your S3 provider.
+provider> Fastly
+
+Option env_auth.
+Get AWS credentials from runtime (environment variables or EC2/ECS meta data if no env vars).
+Only applies if access_key_id and secret_access_key is blank.
+env_auth> false
+
+Option access_key_id.
+AWS Access Key ID.
+access_key_id> YOUR_ACCESS_KEY
+
+Option secret_access_key.
+AWS Secret Access Key (password).
+secret_access_key> YOUR_SECRET_KEY
+
+Option region.
+Region where your bucket will be created and your data stored.
+region> us-east
+
+Option endpoint.
+Endpoint for S3 API.
+endpoint> us-east.object.fastlystorage.app
+
+Edit advanced config?
+y) Yes
+n) No (default)
+y/n> n
+
+Configuration complete.
+Options:
+- type: s3
+- provider: Fastly
+- access_key_id: YOUR_ACCESS_KEY
+- secret_access_key: YOUR_SECRET_KEY
+- region: us-east
+- endpoint: us-east.object.fastlystorage.app
+Keep this "fastly" remote?
+y) Yes this is OK (default)
+e) Edit this remote
+d) Delete this remote
+y/e/d> y
+```
+
+The resulting configuration file should look like:
+
+```ini
+[fastly]
+type = s3
+provider = Fastly
+access_key_id = YOUR_ACCESS_KEY
+secret_access_key = YOUR_SECRET_KEY
+region = us-east
+endpoint = us-east.object.fastlystorage.app
+```
+
 ### Google Cloud Storage
 
 [GoogleCloudStorage](https://cloud.google.com/storage/docs) is an