refactor: split ecr into library and cli crates

The root package becomes a virtual workspace: `crates/ecr` holds the
library (package name `ecr`) and `crates/ecr-cli` the command line
front-end, which keeps installing the `ecr` binary. No behavior change.

The library must not depend on CLI types, so mount::setup_mounts now
takes the `no_bind` flag instead of a `&Args`.

Cargo.toml

@@ -1,50 +1,14 @@
-[package]
-name = "ecr"
+[workspace]
+resolver = "2"
+members = ["crates/ecr", "crates/ecr-cli"]
+
+[workspace.package]
 version = "0.1.0"
 edition = "2021"
 rust-version = "1.77"
-description = "Enter chroot environments with Linux namespaces"
 license = "MIT"
 authors = ["Valentin Haudiquet"]
 
-[dependencies]
-# CLI parsing
-clap = { version = "4", features = ["derive", "env"] }
-
-# Config parsing
-serde = { version = "1", features = ["derive"] }
-serde_yaml = "0.9"
-
-# HTTP downloads
-reqwest = { version = "0.13", features = ["blocking", "stream"] }
-
-# Tarball extraction
-tar = "0.4"
-flate2 = "1"
-xz2 = "0.1"
-zstd = "0.13"
-
-# Unix syscall bindings
-nix = { version = "0.31", features = ["fs", "mount", "sched", "signal", "user", "process", "hostname"] }
-
-# Temp directories
-tempfile = "3"
-
-# Error handling
-anyhow = "1"
-
-# Utilities
-dirs = "6"
-which = "7"
-cpio = "0.4"
-base64 = "0.22"
-tokio = { version = "1", features = ["rt-multi-thread", "macros", "io-util"] }
-futures-util = "0.3"
-indicatif = "0.18"
-serde_json = "1"
-libc = "0.2"
-users = "0.11"
-
 [profile.release]
 strip = true
 opt-level = "z"