Several updates and fixes

- Removed all `thread::sleep` and use `tokio::time::sleep` now.
  This solves an issue with updating to Bullseye ( Resolves #1998 )
- Updated all Debian images to Bullseye
- Added MiMalloc feature and enabled it by default for Alpine based images
  This increases performance for the Alpine images because the default
  memory allocator for MUSL based binaries isn't that fast
- Updated `dotenv` to `dotenvy` a maintained and updated fork
- Fixed an issue with a newer jslib (not fully released yet)
  That version uses a different endpoint for `prelogin` Resolves #2378 )

Cargo.toml

@@ -21,6 +21,9 @@ postgresql = ["diesel/postgres", "diesel_migrations/postgres"]
 sqlite = ["diesel/sqlite", "diesel_migrations/sqlite", "libsqlite3-sys"]
 # Enable to use a vendored and statically linked openssl
 vendored_openssl = ["openssl/vendored"]
+# Enable MiMalloc memory allocator to replace the default malloc
+# This can improve performance for Alpine builds
+enable_mimalloc = ["mimalloc"]
 
 # Enable unstable features, requires nightly
 # Currently only used to enable rusts official ip support
@@ -38,7 +41,7 @@ tracing = { version = "0.1.32", features = ["log"] } # Needed to have lettre and
 backtrace = "0.3.64" # Logging panics to logfile instead stderr only
 
 # A `dotenv` implementation for Rust
-dotenv = { version = "0.15.0", default-features = false }
+dotenvy = { version = "0.15.1", default-features = false }
 
 # Lazy initialization
 once_cell = "1.10.0"
@@ -113,7 +116,7 @@ percent-encoding = "2.1.0" # URL encoding library used for URL's in the emails
 handlebars = { version = "4.2.2", features = ["dir_source"] }
 
 # HTTP client
-reqwest = { version = "0.11.9", features = ["stream", "json", "gzip", "brotli", "socks", "cookies", "trust-dns"] }
+reqwest = { version = "0.11.10", features = ["stream", "json", "gzip", "brotli", "socks", "cookies", "trust-dns"] }
 
 # For favicon extraction from main website
 html5gum = "0.4.0"
@@ -139,6 +142,10 @@ governor = "0.4.2"
 # Capture CTRL+C
 ctrlc = { version = "3.2.1", features = ["termination"] }
 
+# Allow overriding the default memory allocator
+# Mainly used for the musl builds, since the default musl malloc is very slow
+mimalloc = { version = "0.1.28", features = ["secure"], default-features = false, optional = true }
+
 [patch.crates-io]
 rocket = { git = 'https://github.com/SergioBenitez/Rocket', rev = 'ae0ccf43f11be5c00bb9cd49996c8bb06a7e1651' }