feat: add environment variable documentation and update configurations for socket port in Docker setup

webrtc-internals-exporter/webpack/package-lock.json

@@ -12,6 +12,7 @@
         "babel-loader": "^8.2.2",
         "clean-webpack-plugin": "^3.0.0",
         "copy-webpack-plugin": "^12.0.2",
+        "dotenv": "^16.4.7",
         "file-loader": "^6.2.0",
         "html-webpack-plugin": "^5.3.1",
         "mini-css-extract-plugin": "^1.6.0",
@@ -3899,6 +3900,19 @@
         "tslib": "^2.0.3"
       }
     },
+    "node_modules/dotenv": {
+      "version": "16.4.7",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.4.7.tgz",
+      "integrity": "sha512-47qPchRCykZC03FhkYAhrvwU4xDBFIj1QPqaarj6mdM/hgUzfPHcpkHJOn3mJAufFeeAxAzeGsr5X0M4k6fLZQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",