[fix-auth-ct-eq] use argon2 hashing and verification for admin/metrics token checking

Cargo.lock

@@ -120,6 +120,18 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bddcadddf5e9015d310179a59bb28c4d4b9920ad0f11e8e14dbadf654890c9a6"
 
+[[package]]
+name = "argon2"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c3610892ee6e0cbce8ae2700349fcf8f98adb0dbfbee85aec3c9179d29cc072"
+dependencies = [
+ "base64ct",
+ "blake2",
+ "cpufeatures",
+ "password-hash",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.5.2"
@@ -1321,6 +1333,7 @@ dependencies = [
 name = "garage_api"
 version = "0.9.1"
 dependencies = [
+ "argon2",
  "async-trait",
  "base64 0.21.7",
  "bytes",
@@ -2799,6 +2812,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "password-hash"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346f04948ba92c43e8469c1ee6736c7563d71012b17d40745260fe106aac2166"
+dependencies = [
+ "base64ct",
+ "rand_core",
+ "subtle",
+]
+
 [[package]]
 name = "paste"
 version = "1.0.14"