Allow custom gemfile for debug

vscode/package.json

@@ -390,6 +390,11 @@
           "type": "string",
           "default": ""
         },
+        "rubyLsp.debugGemfile": {
+          "description": "Relative or absolute path to the Gemfile to use when running debug.  If unset, the Gemfile used for the Ruby LSP server will be used",
+          "type": "string",
+          "default": ""
+        },
         "rubyLsp.testTimeout": {
           "description": "The amount of time in seconds to wait for a test to finish before timing out. Only used when running tests from the test explorer",
           "type": "integer",

vscode/src/debugger.ts

@@ -1,6 +1,7 @@
 import net from "net";
 import os from "os";
 import { ChildProcessWithoutNullStreams, spawn } from "child_process";
+import path from "path";
 
 import * as vscode from "vscode";
 
@@ -129,6 +130,21 @@ export class Debugger
 
     const customBundleUri = vscode.Uri.joinPath(workspaceUri, ".ruby-lsp");
 
+    const customDebugGemfile: string = vscode.workspace
+      .getConfiguration("rubyLsp")
+      .get("debugGemfile")!;
+
+    // allow user to override the default of using the RubyLsp Gemfile
+    // when debugging
+    if (customDebugGemfile.length > 0) {
+      debugConfiguration.env.BUNDLE_GEMFILE = path.isAbsolute(
+        customDebugGemfile,
+      )
+        ? customDebugGemfile
+        : path.resolve(path.join(workspaceUri.fsPath, customDebugGemfile));
+      return debugConfiguration;
+    }
+
     return vscode.workspace.fs.readDirectory(customBundleUri).then(
       (value) => {
         if (value.some((entry) => entry[0] === "Gemfile")) {