Add file copier lambda to the local environment

[liam-lloyd]

We recently added a lambda to stela to handle the asynchronous parts of record copy. This commit adds it to our local environment.

[liam-lloyd]

Testing this is the same as testing PermanentOrg/stela#757, but in your local environment

[Copilot]

Pull request overview

Adds the File Copier Lambda to the local development environment so local SNS/SQS event flow can invoke it through SAM Local and the SQS-Lambda bridge.

Changes:

• Adds LocalStack SQS queue, policy, and SNS subscription for file copy events.
• Adds FileCopier SAM function, Docker image builder, and start-script env wiring.
• Extends the bridge example config with a FileCopier queue-to-Lambda mapping.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sqs-lambda-bridge/config.example.json	Adds a FileCopier bridge entry for the LocalStack queue.
localstack-init/setup_resources.sh	Creates and subscribes the FileCopier queue to local SNS events.
lambda/start-sam-local.sh	Checks for the FileCopier image and passes its local env vars to SAM.
lambda/sam_template.yaml	Defines the FileCopier SAM function and outputs.
docker-compose.yml	Adds the FileCopier Lambda image builder and LocalStack dependency.

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[slifty]

I believe this is working -- I was able to run the copier locally