feat: Check offer creation times for recency

[bgins]

Summary

This pull request makes the following changes:

• Check job offer CreatedAt time is recent
• Check resource offer CreatedAt time is recent
• Add isTimestampRecent helper to check timestamps fall into a time window near now
  • Add TestIsTimestampRecent test
• Add SERVER_OFFER_TIMESTAMP_DIFF_SECONDS config

This pull request checks that job and resource offers report a creation time that is recent.

We have also renamed the ANURA_ADDRESSES config to SERVER_ANURA_ADDRESSES.

Task/Issue reference

Implements: #506

Test plan

Start the stack. Run a job. This should succeed with the resource offer and job offer received by the solver within the default 30 second diff.

We have added a temporary commit (bc0ff33) to demonstrate the failure case. Replace this line with the one below it to set the diff to 1ms, the restart the stack and run a job. In my local tests, this diff is small enough to trigger a failure. Hopefully true on your machine too. 🤞

Details

Configs

We have added a SERVER_OFFER_TIMESTAMP_DIFF_SECONDS config that can be set as a CLI option or environment variable:

./stack solver --server-offer-timestamp-diff-seconds 10
SERVER_OFFER_TIMESTAMP_DIFF_SECONDS=10 ./stack solver

Creation time check

We check that offer CreatedAt times are recent within a time window set by SERVER_OFFER_TIMESTAMP_DIFF_SECONDS. The time window starts SERVER_OFFER_TIMESTAMP_DIFF_SECONDS before the check time and ends SERVER_OFFER_TIMESTAMP_DIFF_SECONDS after.

Related issues or PRs

Epic: https://github.com/Lilypad-Tech/internal/issues/348

[kelindi]

Looks good to me