Add support for S3-backed image storage

Cargo.toml

@@ -36,6 +36,9 @@ oauth2 = "4"
 csv = "1.2"
 sd-notify = "0.4.1"
 cron-parser = "0.10"
+image = { version = "0.25", default-features = false, features = ["jpeg", "png", "gif", "webp"] }
+nsfw = { version = "0.2", default-features = false }
+rust-s3 = { version = "0.38", default-features = false, features = ["tokio-rustls-tls"] }
 
 [dependencies.extract_derive]
 path = "extract_derive"
@@ -68,6 +71,12 @@ conf-files = [
     "/etc/reminder-rs/Rocket.toml",
 ]
 
-[package.metadata.deb.systemd-units]
+[[package.metadata.deb.systemd-units]]
 unit-scripts = "systemd"
+unit-name = "reminder-rs"
+start = false
+
+[[package.metadata.deb.systemd-units]]
+unit-scripts = "systemd"
+unit-name = "reminder-rs-clean-images"
 start = false