Add support for config file in image directory

This config file will be loaded together with the images and defines the
passwords for login and some other parameters.

Cargo.lock

@@ -682,6 +682,12 @@ dependencies = [
  "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
 [[package]]
 name = "headers"
 version = "0.3.8"
@@ -868,12 +874,23 @@ dependencies = [
  "kamadak-exif",
  "minijinja",
  "serde",
+ "serde_yaml",
  "tokio",
  "tower-http",
  "tracing",
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "indexmap"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
 [[package]]
 name = "inout"
 version = "0.1.3"
@@ -1358,6 +1375,19 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.9.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9d684e3ec7de3bf5466b32bd75303ac16f0736426e5a4e0d6e489559ce1249c"
+dependencies = [
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde",
+ "unsafe-libyaml",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.5"
@@ -1741,6 +1771,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1865806a559042e51ab5414598446a5871b561d21b6764f2eabb0dd481d880a6"
+
 [[package]]
 name = "valuable"
 version = "0.1.0"