fix(runners): wire job_retry.lambda_memory_size and lambda_timeout

[oscarbc96]

Description

Both var.job_retry (in modules/multi-runner/variables.tf and modules/runners/variables.tf) declare lambda_memory_size and lambda_timeout as documented configuration fields, but local.job_retry in modules/runners/job-retry.tf never copies either field into the config map passed to the inner job-retry / lambda sub-modules. The inner lambda module then falls back to its defaults (memory_size = 256, timeout = 60), so user-supplied values are silently dropped — tofu plan shows no diff and the running Lambda keeps its defaults.

The fix is a two-line addition to the local.job_retry map. It mirrors the pattern modules/runners/ssm-housekeeper.tf already uses for local.ssm_housekeeper.lambda_memory_size / local.ssm_housekeeper.lambda_timeout — that Lambda correctly threads the values through.

Motivation

Discovered in production: I pinned lambda_memory_size = 512 in multi_runner_config[*].runner_config.job_retry after observing the job-retry Lambdas at 87% memory utilisation (223 MB peak on the 256 MB default), and got No changes from tofu plan. Tracing the wiring confirmed the value never reaches the resource.

Reproduction

module "runners" {
  source  = "github-aws-runners/github-runner/aws//modules/multi-runner"
  version = "7.6.0"
  # …
  multi_runner_config = {
    "example" = {
      matcherConfig = { … }
      runner_config = merge(local.default_config, {
        # … other config …
        job_retry = {
          enable             = true
          lambda_memory_size = 512  # ← silently ignored before this PR
          lambda_timeout     = 60   # ← silently ignored before this PR
        }
      })
    }
  }
}

After this fix, tofu plan shows the expected memory_size: 256 -> 512 change on the job-retry Lambda.

Verification

• tofu fmt clean.
• The variable type definition on both modules/runners/variables.tf and modules/multi-runner/variables.tf already declares lambda_memory_size = optional(number, 256) and lambda_timeout = optional(number, 30), so no public surface changes.
• The inner modules/runners/modules/lambda accepts memory_size and timeout on its lambda input object (with the same defaults), so when the wiring is restored the values flow through naturally.

No-impact when not set

Defaults remain memory_size = 256 (per the variable declaration) and timeout = 30 — same as today's effective values when nothing is overridden.