Feat #99: add external_batch Indexed Job + runner ConfigMap

Adds an opt-in batch/v1 Job (templates/job-external-batch.yaml) that
runs external_batch_run analyses as native Kubernetes Indexed Jobs on
the existing cluster, reusing the chart's NFS PVC. Each pod gets a
JOB_COMPLETION_INDEX via the downward API and processes one slice of
the manifest.json chunks array.

Files added:

- templates/job-external-batch.yaml -- rendered only when
  external_batch.enabled=true. batch/v1 Job, completionMode: Indexed,
  parameterized completions/parallelism/backoffLimit/activeDeadlineSeconds
  /ttlSecondsAfterFinished. Pod uses worker node-group affinity
  (openstudio-server.nodeGroupAffinity from # PR1), low priority, 5200s
  termination grace (matches worker pods). Two volume mounts: the
  chart's NFS PVC at storage.mountPath and a runner-script ConfigMap
  at /scripts/run_chunk.rb (defaultMode 0o755). Container args invoke
  the runner with --package, --results, --chunk JOB_COMPLETION_INDEX,
  --openstudio /usr/local/bin/openstudio.

- templates/runner-cm.yaml -- ConfigMap sourced from
  configmaps/runner/run_chunk.rb via .Files.Get. Carries the upstream
  runner script (plain stdlib Ruby + OpenStudio CLI) so chunk pods
  don't depend on the script being baked into the worker image.

- configmaps/runner/run_chunk.rb -- the upstream external_batch runner,
  fetched verbatim from commit d63c8eb2e3b37bca2494e66cab3c4457cf5c4e61
  of NatLabRockies/OpenStudio-server (the same commit that produced the
  digest pinned in external_batch.container.image).

Files modified:

- openstudio-server/values.yaml -- append external_batch block. Image
  default is pinned by digest to the runner-supporting upstream tag
  (intentionally decoupled from chart appVersion 3.8.0-1, which
  predates the runner). All other parameters mirror the issue spec.

- openstudio-server/Chart.yaml -- 0.6.1 -> 0.7.0 (minor). Opt-in
  feature; default values render exactly as before.

Notable spec drift from the issue body (commit message for posterity):

The issue body proposed the runner as:

  ruby /openstudio-server/external_batch/runner/run_chunk.rb \
    --analysis-id <ID> \
    --chunk-id <N> \
    --storage-dir <DIR>

The actual upstream runner uses (verified by pulling the digest-pinned
image and inspecting /opt/openstudio/server/app/lib/external_batch/* +
raw.githubusercontent.com/NatLabRockies/OpenStudio-server/d63c8eb/
external_batch/runner/run_chunk.rb):

  ruby run_chunk.rb \
    --package <DIR> --results <DIR> --chunk <N> --openstudio <CMD>

Differences:

  * run_chunk.rb is NOT in the nrel/openstudio-server image. It is
    fetched from the OpenStudio-server repo at runtime. This PR ships
    it via ConfigMap.
  * Flags are --package/--results/--chunk/--openstudio (no
    --analysis-id, no --storage-dir, --chunk is the chunk index).
  * analysis_id is read from manifest.json, not from a CLI flag.
  * The runner expects the package at <mountPath>/external_batch/
    analysis_<id>/package/ and writes results to <mountPath>/
    external_batch/analysis_<id>/results/. The server's
    ExternalBatch::Packager writes that layout when an analysis is
    submitted with --batch-run-method external_batch_run.

Verified:

  * helm lint clean
  * helm template at default values: 0 external_batch references
  * helm template --set external_batch.enabled=true ...: 1 Job +
    1 ConfigMap rendered
  * Pod-args template content matches the actual runner CLI
  * Storage PVC override (storage.existingClaim) propagates correctly
  * Downward API for JOB_COMPLETION_INDEX uses
    batch.kubernetes.io/job-completion-index (k8s 1.21+)

Closes #99.

Author: anchapin

openstudio-server/Chart.yaml

@@ -14,7 +14,7 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 0.6.1
+version: 0.7.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.