Split devcontainer.json file path out to a settings module

src/main/kotlin/com/coder/jetbrains/services/CoderPortForwardService.kt

@@ -18,6 +18,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
 import org.json.JSONObject
+import com.coder.jetbrains.settings.CoderBackendSettings
 
 /**
  * Automatically forward ports that have something listening on them by scanning
@@ -56,8 +57,7 @@ class CoderPortForwardService(
     }
 
     private fun start() {
-        // TODO: make path configurable?
-        val devcontainerFile = File(System.getProperty("user.home"), ".cache/JetBrains/devcontainer.json")
+        val devcontainerFile = CoderBackendSettings.getDevcontainerFile()
         if (devcontainerFile.exists()) {
             try {
                 val json = devcontainerFile.readText()

src/main/kotlin/com/coder/jetbrains/settings/CoderBackendSettings.kt

@@ -0,0 +1,10 @@
+package com.coder.jetbrains.settings
+
+import java.io.File
+
+object CoderBackendSettings {
+    fun getDevcontainerFile(): File {
+        // TODO: make path configurable?
+        return File(System.getProperty("user.home"), ".cache/JetBrains/devcontainer.json")
+    }
+}