agent: Add anyhow dependency

anyhow provides `anyhow::Error`, a trait object based error type for
easy idiomatic error handling in Rust applications

Signed-off-by: Julio Montes <julio.montes@intel.com>

src/agent/Cargo.lock

@@ -24,6 +24,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b602bfe940d21c130f3895acd65221e8a61270debe89d628b9cb4e3ccb8569b"
+
 [[package]]
 name = "arc-swap"
 version = "0.4.6"
@@ -262,6 +268,7 @@ checksum = "b8b7a7c0c47db5545ed3fef7468ee7bb5b74691498139e4b3f6a20685dc6dd8e"
 name = "kata-agent"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "error-chain",
  "lazy_static",
  "libc",
@@ -652,6 +659,7 @@ checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 name = "rustjail"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "caps",
  "dirs",
  "error-chain",

src/agent/Cargo.toml

@@ -32,6 +32,7 @@ slog-scope = "4.1.2"
 tempfile = "3.1.0"
 prometheus = { version = "0.9.0", features = ["process"] }
 procfs = "0.7.9"
+anyhow = "1.0.32"
 
 [workspace]
 members = [