Docker alpine dependency?

Hello,
Thanks so much for putting together this sample. I am trying to deploy on a fresh Cloud9 instance, and `cdk deploy` is bombing on the `esbuild` step. Suggestions for getting over this hurdle? Stack is below.

```
Step 13/13 : CMD [ "esbuild" ]
---> Using cache
---> 3fcfc461ced5
Successfully built 3fcfc461ced5
Successfully tagged cdk-bbcea2a50b8f6765844d66b3c00cbcc5065e43223302af8fb64e1148037d29f5:latest
Bundling asset BookStack/frontend/FrontendAppDeploy/Asset1/Stage...
/bin/sh: esbuild: command not found
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
96526aa774ef: Pull complete
Digest: sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978
Status: Downloaded newer image for alpine:latest
Docker build not supported. Please install esbuild.
/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/asset-staging.js:2
`),localBundling=options.local?.tryBundle(bundleDir,options),!localBundling){const assetStagingOptions={sourcePath:this.sourcePath,bundleDir,...options};switch(options.bundlingFileAccess){case bundling_1.BundlingFileAccess.VOLUME_COPY:new asset_staging_1.AssetBundlingVolumeCopy(assetStagingOptions).run();break;case bundling_1.BundlingFileAccess.BIND_MOUNT:default:new asset_staging_1.AssetBundlingBindMount(assetStagingOptions).run();break}}}catch(err){const bundleErrorDir=bundleDir+"-error";throw fs.existsSync(bundleErrorDir)&&fs.removeSync(bundleErrorDir),fs.renameSync(bundleDir,bundleErrorDir),new Error(`Failed to bundle asset ${this.node.path}, bundle output is located at ${bundleErrorDir}: ${err}`)}if(fs_1.FileSystem.isEmpty(bundleDir)){const outputDir=localBundling?bundleDir:AssetStaging.BUNDLING_OUTPUT_DIR;throw new Error(`Bundling did not produce any output. Check that content is written to ${outputDir}.`)}}calculateHash(hashType,bundling,outputDir){if(hashType==assets_1.AssetHashType.CUSTOM||hashType==assets_1.AssetHashType.SOURCE&&bundling){const hash=crypto.createHash("sha256");return hash.update(this.customSourceFingerprint??fs_1.FileSystem.fingerprint(this.sourcePath,this.fingerprintOptions)),bundling&&hash.update(JSON.stringify(bundling)),hash.digest("hex")}switch(hashType){case assets_1.AssetHashType.SOURCE:return fs_1.FileSystem.fingerprint(this.sourcePath,this.fingerprintOptions);case assets_1.AssetHashType.BUNDLE:case assets_1.AssetHashType.OUTPUT:if(!outputDir)throw new Error(`Cannot use \`${hashType}\` hash type when \`bundling\` is not specified.`);return fs_1.FileSystem.fingerprint(outputDir,this.fingerprintOptions);default:throw new Error("Unknown asset hash type.")}}}exports.AssetStaging=AssetStaging,_a=JSII_RTTI_SYMBOL_1,AssetStaging[_a]={fqn:"aws-cdk-lib.AssetStaging",version:"2.92.0"},AssetStaging.BUNDLING_INPUT_DIR="/asset-input",AssetStaging.BUNDLING_OUTPUT_DIR="/asset-output",AssetStaging.assetCache=new cache_1.Cache;function renderAssetFilename(assetHash,extension=""){return`asset.${assetHash}${extension}`}function determineHashType(assetHashType,customSourceFingerprint){const hashType=customSourceFingerprint?assetHashType??assets_1.AssetHashType.CUSTOM:assetHashType??assets_1.AssetHashType.SOURCE;if(customSourceFingerprint&&hashType!==assets_1.AssetHashType.CUSTOM)throw new Error(`Cannot specify \`${assetHashType}\` for \`assetHashType\` when \`assetHash\` is specified. Use \`CUSTOM\` or leave \`undefined\`.`);if(hashType===assets_1.AssetHashType.CUSTOM&&!customSourceFingerprint)throw new Error("`assetHash` must be specified when `assetHashType` is set to `AssetHashType.CUSTOM`.");return hashType}function calculateCacheKey(props){return crypto.createHash("sha256").update(JSON.stringify(sortObject(props))).digest("hex")}function sortObject(object){if(typeof object!="object"||object instanceof Array)return object;const ret={};for(const key of Object.keys(object).sort())ret[key]=sortObject(object[key]);return ret}function singleArchiveFile(directory){if(!fs.existsSync(directory))throw new Error(`Directory ${directory} does not exist.`);if(!fs.statSync(directory).isDirectory())throw new Error(`${directory} is not a directory.`);const content=fs.readdirSync(directory);if(content.length===1){const file=path.join(directory,content[0]),extension=getExtension(content[0]).toLowerCase();if(fs.statSync(file).isFile()&&ARCHIVE_EXTENSIONS.includes(extension))return file}}function determineBundledAsset(bundleDir,outputType){const archiveFile=singleArchiveFile(bundleDir);switch(outputType===bundling_1.BundlingOutput.AUTO_DISCOVER&&(outputType=archiveFile?bundling_1.BundlingOutput.ARCHIVED:bundling_1.BundlingOutput.NOT_ARCHIVED),outputType){case bundling_1.BundlingOutput.NOT_ARCHIVED:return{path:bundleDir,packaging:assets_1.FileAssetPackaging.ZIP_DIRECTORY};case bundling_1.BundlingOutput.ARCHIVED:if(!archiveFile)throw new Error("Bundling output directory is expected to include only a single archive file when `output` is set to `ARCHIVED`");return{path:archiveFile,packaging:assets_1.FileAssetPackaging.FILE,extension:getExtension(archiveFile)}}}function getExtension(source){for(const ext of ARCHIVE_EXTENSIONS)if(source.toLowerCase().endsWith(ext))return ext;return path.extname(source)}
^
Error: Bundling did not produce any output. Check that content is written to /asset-output.
at AssetStaging.bundle (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/asset-staging.js:2:830)
at AssetStaging.stageByBundling (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/asset-staging.js:1:4544)
at stageThisAsset (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/asset-staging.js:1:2005)
at Cache.obtain (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/private/cache.js:1:242)
at new AssetStaging (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/core/lib/asset-staging.js:1:2400)
at new Asset (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/aws-s3-assets/lib/asset.js:1:736)
at Object.bind (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/aws-s3-deployment/lib/source.js:1:1185)
at /home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/aws-s3-deployment/lib/bucket-deployment.js:1:3096
at Array.map ()
at new BucketDeployment (/home/ec2-user/environment/aws-lambda-function-url-secured/node_modules/aws-cdk-lib/aws-s3-deployment/lib/bucket-deployment.js:1:3077)
```