fix: inline ENV variables when building excalidraw package (#4311)

src/packages/excalidraw/webpack.dev.config.js

@@ -1,6 +1,7 @@
 const path = require("path");
 const webpack = require("webpack");
 const autoprefixer = require("autoprefixer");
+const { parseEnvVariables } = require("./env");
 
 module.exports = {
   mode: "development",
@@ -76,7 +77,14 @@ module.exports = {
       },
     },
   },
-  plugins: [new webpack.EvalSourceMapDevToolPlugin({ exclude: /vendor/ })],
+  plugins: [
+    new webpack.EvalSourceMapDevToolPlugin({ exclude: /vendor/ }),
+    new webpack.DefinePlugin({
+      "process.env": parseEnvVariables(
+        path.resolve(__dirname, "../../../.env.development"),
+      ),
+    }),
+  ],
   externals: {
     react: {
       root: "React",