[ANCHOR-936] Fix ktReferenceServerConfig is not populated correctly

kotlin-reference-server/src/main/kotlin/org/stellar/reference/StringHelperKt.kt

@@ -0,0 +1,25 @@
+package org.stellar.reference
+
+/**
+ * Converts a dot-separated string to camelCase. For example: - "kt.reference.server.config" becomes
+ * "ktReferenceServerConfig"
+ *
+ * @param s The dot-separated string to be converted.
+ * @return A string in camelCase format.
+ * @throws NullPointerException If the input string is null.
+ */
+fun dotToCamelCase(s: String): String {
+  return s.split(".") // Split by dot
+    .mapIndexed { index, part ->
+      if (part.isEmpty()) {
+        "" // Ignore empty parts caused by consecutive dots or leading/trailing dots
+      } else if (index == 0) {
+        part.replaceFirstChar {
+          it.lowercaseChar()
+        } // Ensure the first part starts with a lowercase letter
+      } else {
+        part.replaceFirstChar { it.uppercaseChar() } // Capitalize the first letter of other parts
+      }
+    }
+    .joinToString("") // Join all parts back together as camelCase
+}

kotlin-reference-server/src/main/kotlin/org/stellar/reference/di/ConfigContainer.kt

@@ -3,6 +3,7 @@ package org.stellar.reference.di
 import com.sksamuel.hoplite.*
 import org.stellar.reference.data.Config
 import org.stellar.reference.data.LocationConfig
+import org.stellar.reference.dotToCamelCase
 
 class ConfigContainer(envMap: Map<String, String>?) {
   var config: Config = readCfg(envMap)
@@ -25,15 +26,17 @@ class ConfigContainer(envMap: Map<String, String>?) {
       val locationCfgBuilder =
         ConfigLoaderBuilder.default().addPropertySource(PropertySource.environment())
 
-      val cfgBuilder = ConfigLoaderBuilder.default()
-
       // Add environment variables as a property source for the config object
-      cfgBuilder.addPropertySource(PropertySource.environment())
+      val cfgBuilder = ConfigLoaderBuilder.default().addPropertySource(PropertySource.environment())
 
       // Add any environment variable overrides from the envMap
       envMap?.run {
-        locationCfgBuilder.addMapSource(this)
+        // env variables override
         cfgBuilder.addMapSource(this)
+
+        // for the location config, we need to convert the keys to camel case
+        val camelEnvMap = this.mapKeys { (key, _) -> dotToCamelCase(key) }
+        locationCfgBuilder.addMapSource(camelEnvMap)
       }
 
       val locationConfig = locationCfgBuilder.build().loadConfigOrThrow<LocationConfig>()