feat: put airgap client build in a separate folder (#22413)

## Description

- Adds a new build output dir `build_airgap` for airgap client builds. 


Fixes #22414

app/client/.gitignore

@@ -12,6 +12,7 @@
 
 # production
 /build
+/build_airgap
 
 # misc
 .DS_Store

app/client/build.sh

@@ -6,13 +6,21 @@ GIT_SHA=$(eval git rev-parse HEAD)
 echo $GIT_SHA
 echo "Sentry Auth Token: $SENTRY_AUTH_TOKEN"
 
+if [ "$REACT_APP_AIRGAP_ENABLED" == "true" ]; then
+    echo "Building for airgapped Appsmith instances"
+    OUTPUT_PATH=build_airgap
+else
+    echo "Building for non-airgapped Appsmith instances"
+    OUTPUT_PATH=build
+fi
+
 # build cra app
 REACT_APP_SENTRY_RELEASE=$GIT_SHA REACT_APP_CLIENT_LOG_LEVEL=ERROR EXTEND_ESLINT=true craco --max-old-space-size=4096 build --config craco.build.config.js
 
 if [ "$GITHUB_REPOSITORY" == "appsmithorg/appsmith-ee" ]; then
     echo "Deleting sourcemaps for EE"
-    rm ./build/static/js/*.js.map
+    rm ./$OUTPUT_PATH/static/js/*.js.map
-    rm ./build/static/js/*.js.map.gz
+    rm ./$OUTPUT_PATH/static/js/*.js.map.gz
 fi
 
 echo "build finished"

app/client/craco.build.config.js

@@ -5,9 +5,9 @@ const common = require("./craco.common.config.js");
 const WorkboxPlugin = require("workbox-webpack-plugin");
 const CompressionPlugin = require("compression-webpack-plugin");
 const { RetryChunkLoadPlugin } = require("webpack-retry-chunk-load-plugin");
-
+const path = require("path");
 const env = process.env.REACT_APP_ENVIRONMENT;
-
+const isAirgap = process.env.REACT_APP_AIRGAP_ENABLED;
 const plugins = [];
 
 plugins.push(
@@ -66,6 +66,25 @@ plugins.push(
 
 module.exports = merge(common, {
   webpack: {
+    configure: (webpackConfig, { env, paths }) => {
+      if (env.REACT_APP_AIRGAP_ENABLED === "true" || isAirgap === "true") {
+        paths.appBuild = webpackConfig.output.path =
+          path.resolve("build_airgap");
+      }
+      webpackConfig.resolve.fallback = {
+        assert: false,
+        stream: false,
+        util: false,
+        fs: false,
+        os: false,
+        path: false,
+      };
+      webpackConfig.module.rules.push({
+        test: /\.m?js/,
+        resolve: { fullySpecified: false },
+      });
+      return webpackConfig;
+    },
     plugins: plugins,
   },
   jest: {