$ yarn install --check-cache
➤ YN0000: ┌ Resolution step
Resolution step
00:01
➤ YN0000: └ Completed in 0s 301ms
➤ YN0000: ┌ Fetch step
Fetch step
00:52
➤ YN0000: └ Completed in 52s 574ms
➤ YN0000: ┌ Link step
Link step
00:53
➤ YN0000: └ Completed in 53s 299ms
➤ YN0000: Done with warnings in 1m 47s
$ npx sst deploy --stage test --verbose
SST: 0.56.1
CDK: 1.132.0
Using stage: test
Preparing your SST app
synth {
  output: '.build/cdk.out',
  app: 'node .build/run.js',
  rollback: true,
  roleArn: undefined,
  verbose: 2,
  noColor: true
}
CDK toolkit version: 1.132.0 (build 5c75891)
Command line arguments: {
  _: [ 'synth' ],
  'version-reporting': false,
  versionReporting: false,
  app: 'node .build/run.js',
  a: 'node .build/run.js',
  output: '.build/cdk.out',
  o: '.build/cdk.out',
  quiet: true,
  q: true,
  color: false,
  verbose: 1,
  v: 1,
  disableVersionCheck: 'true',
  lookups: true,
  'ignore-errors': false,
  ignoreErrors: false,
  json: false,
  j: false,
  debug: false,
  ec2creds: undefined,
  i: undefined,
  'path-metadata': true,
  pathMetadata: true,
  'asset-metadata': true,
  assetMetadata: true,
  'role-arn': undefined,
  r: undefined,
  roleArn: undefined,
  staging: true,
  'no-color': false,
  noColor: false,
  validation: true,
  '$0': 'node_modules/aws-cdk/bin/cdk'
}
merged settings: {
  versionReporting: false,
  pathMetadata: true,
  output: '.build/cdk.out',
  app: 'node .build/run.js',
  context: {},
  debug: false,
  assetMetadata: true,
  toolkitBucket: {},
  staging: true,
  bundlingStacks: [ '*' ],
  lookups: true
}
Determining if we're on an EC2 instance.
Looks like an EC2 instance.
Looking up AWS region in the EC2 Instance Metadata Service (IMDS).
Attempting to retrieve an IMDSv2 token.
No IMDSv2 token: TimeoutError: Connection timed out after 1000ms
Retrieving the AWS region from the IMDS.
AWS region from IMDS: eu-west-2
Toolkit stack: CDKToolkit
Setting "CDK_DEFAULT_REGION" environment variable to eu-west-2
Resolving default credentials
...
...
[dotenv][DEBUG] did not match key and value when parsing line 1: # These variables are only available in your SST code.
[dotenv][DEBUG] did not match key and value when parsing line 2: # To apply them to your Lambda functions, checkout this doc - <https://docs.serverless-stack.com/environment-variables#environment-variables-in-lambda-functions>
[dotenv][DEBUG] did not match key and value when parsing line 3: 
[dotenv][DEBUG] did not match key and value when parsing line 5: 
There was a problem installing nodeModules.
Error: Command failed: yarn install
    at checkExecSyncError (node:child_process:826:11)
    at execSync (node:child_process:900:15)
    at installNodeModules (/builds/<.../.../...>/node_modules/@serverless-stack/core/dist/runtime/handler/node.js:289:38)
    at Object.bundle (/builds/<.../.../...>/node_modules/@serverless-stack/core/dist/runtime/handler/node.js:204:13)
    at Object.bundle (/builds/<.../.../...>/node_modules/@serverless-stack/core/dist/runtime/handler/handler.js:19:16)
    at new Function (/builds/<.../.../...>/node_modules/@serverless-stack/resources/src/Function.ts:359:39)
    at Function.fromDefinition (/builds/<.../.../...>/node_modules/@serverless-stack/resources/src/Function.ts:528:14)
    at Queue.addConsumer (/builds/<.../.../...>/node_modules/@serverless-stack/resources/src/Queue.ts:100:32)
    at new Queue (/builds/<.../.../...>/node_modules/@serverless-stack/resources/src/Queue.ts:75:12)
    at new ControllerStack (/builds/<.../.../...>/stacks/controller-stack.ts:87:26)
Error: Subprocess exited with error 1
    at ChildProcess.<anonymous> (/builds/<.../.../...>/node_modules/aws-cdk/lib/api/cxapp/exec.ts:127:23)
    at ChildProcess.emit (node:events:390:28)
    at ChildProcess.emit (node:domain:475:12)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:290:12)
There was an error synthesizing your app.
Cleaning up project directory and file based variables
00:01
ERROR: Job failed: exit code 1

const commandQueue = new sst.Queue(this, "CommandQueue", {
      consumer: {
        function: {
          handler: "src/handlers/command.consumer",
          timeout: commandHandlerTimeout,
          environment: {
            ROLE_ARN: role.roleArn,
            NOTIFICATIONS_ARN: monitoringTopic.topicArn,
            TRACKING_TABLE: trackingTable.tableName,
            DEPLOYMENT_TABLE: deploymentTable.tableName,
          },
          bundle: {
            nodeModules: ["proxy-agent"],
          },
          permissions: [trackingTable, deploymentTable],
        },
      },
      sqsQueue: {
        fifo: true,
        visibilityTimeout: Duration.seconds(commandVisibilityTimeout),
      },
    });

sst build

stdio: "inherit"

If none of the above work, let me know. I can cut a canary release with more debug info and you can give that a try.

export YARN_ENABLE_IMMUTABLE_INSTALLS=false