Feature/subcontainers (#2720)

* wip: subcontainers

* wip: subcontainer infra

* rename NonDestroyableOverlay to SubContainerHandle

* chore: Changes to the container and other things

* wip:

* wip: fixes

* fix launch & exec

Co-authored-by: Jade <Blu-J@users.noreply.github.com>

* tweak apis

* misc fixes

* don't treat sigterm as error

* handle health check set during starting

---------

Co-authored-by: J H <dragondef@gmail.com>
Co-authored-by: Jade <Blu-J@users.noreply.github.com>

core/Cargo.lock

@@ -533,7 +533,7 @@ dependencies = [
  "rustc-hash",
  "shlex",
  "syn 2.0.74",
- "which",
+ "which 4.4.2",
 ]
 
 [[package]]
@@ -1580,6 +1580,17 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
+[[package]]
+name = "errno"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f639046355ee4f37944e44f60642c6f3a7efa3cf6b78c78a0d989a8ce6c396a1"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "errno"
 version = "0.3.9"
@@ -1590,6 +1601,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "errno-dragonfly"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "etcetera"
 version = "0.8.0"
@@ -3034,6 +3055,18 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "nix"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa9b4819da1bc61c0ea48b63b7bc8604064dd43013e7cc325df098d49cd7c18a"
+dependencies = [
+ "bitflags 1.3.2",
+ "cc",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "nix"
 version = "0.24.3"
@@ -3687,6 +3720,32 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "procfs"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "731e0d9356b0c25f16f33b5be79b1c57b562f141ebfcdb0ad8ac2c13a24293b4"
+dependencies = [
+ "bitflags 2.6.0",
+ "chrono",
+ "flate2",
+ "hex",
+ "lazy_static",
+ "procfs-core",
+ "rustix",
+]
+
+[[package]]
+name = "procfs-core"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d3554923a69f4ce04c4a754260c338f505ce22642d3830e049a399fc2059a29"
+dependencies = [
+ "bitflags 2.6.0",
+ "chrono",
+ "hex",
+]
+
 [[package]]
 name = "proptest"
 version = "1.5.0"
@@ -4174,7 +4233,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70dc5ec042f7a43c4a73241207cecc9873a06d45debb38b329f8541d85c2730f"
 dependencies = [
  "bitflags 2.6.0",
- "errno",
+ "errno 0.3.9",
  "libc",
  "linux-raw-sys",
  "windows-sys 0.52.0",
@@ -5040,6 +5099,7 @@ dependencies = [
  "pin-project",
  "pkcs8",
  "prettytable-rs",
+ "procfs",
  "proptest",
  "proptest-derive",
  "rand 0.8.5",
@@ -5058,6 +5118,7 @@ dependencies = [
  "serde_yml",
  "sha2 0.10.8",
  "shell-words",
+ "signal-hook",
  "simple-logging",
  "socket2",
  "sqlx",
@@ -5084,9 +5145,12 @@ dependencies = [
  "trust-dns-server",
  "ts-rs",
  "typed-builder",
+ "unix-named-pipe",
+ "unshare",
  "url",
  "urlencoding",
  "uuid",
+ "which 6.0.3",
  "zeroize",
 ]
 
@@ -5965,6 +6029,26 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39ec24b3121d976906ece63c9daad25b85969647682eee313cb5779fdd69e14e"
 
+[[package]]
+name = "unix-named-pipe"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ad653da8f36ac5825ba06642b5a3cce14a4e52c6a5fab4a8928d53f4426dae2"
+dependencies = [
+ "errno 0.2.8",
+ "libc",
+]
+
+[[package]]
+name = "unshare"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ceda295552a1eda89f8a748237654ad76b9c87e383fc07af5c4e423eb8e7b9b"
+dependencies = [
+ "libc",
+ "nix 0.20.0",
+]
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
@@ -6182,6 +6266,18 @@ dependencies = [
  "rustix",
 ]
 
+[[package]]
+name = "which"
+version = "6.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4ee928febd44d98f2f459a4a79bd4d928591333a494a10a868418ac1b39cf1f"
+dependencies = [
+ "either",
+ "home",
+ "rustix",
+ "winsafe",
+]
+
 [[package]]
 name = "whoami"
 version = "1.5.1"
@@ -6408,6 +6504,12 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "winsafe"
+version = "0.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904"
+
 [[package]]
 name = "wyz"
 version = "0.2.0"