DDEV CI Acceleration Playbook with WarpBuild for Drupal Pipelines

Use WarpBuild runners for the compute-heavy parts of your DDEV Drupal pipeline, keep cache keys deterministic, and gate rollout by p95 runtime and failure-rate SLOs. This gives you faster CI without turning your pipeline into a probabilistic black box. I verified this playbook against DDEV v1.25.1 (released February 23, 2026) and WarpBuild docs as of February 25, 2026.

The problem

Drupal CI pipelines that boot DDEV, run Composer, and execute tests typically lose time in three places:

Bottleneck	Typical symptom	Why it hurts
Cold VM startup	Slow first job on each PR	Adds fixed latency to every run
Dependency re-download	Composer cache misses	Repeats network + unzip work
Unsafe rollout	Team flips all jobs at once	Outages hide whether speed gains are real

Not a Decision Signal

Without a reproducible benchmark method, "CI feels faster" is not a decision signal. You need p50/p95 numbers from controlled runs.

The solution

I use one workflow template and one benchmark script as the source of truth.

Workflow template

WarpBuild Runner

examples/devops/ddev-warpbuild-drupal-ci.yml

jobs:
  test:
runs-on: warp-ubuntu-latest-x64-4x
steps:
- uses: actions/checkout@v4
- uses: actions/cache@v4
with:
path: ~/.cache/composer
key: composer-${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
- uses: ddev/github-action-setup-ddev@v1
- run: ddev start
- run: ddev composer install --no-interaction --prefer-dist
- run: ddev exec phpunit -c web/core

GitHub-Hosted (Baseline)

examples/devops/ddev-github-hosted-drupal-ci.yml

jobs:
  test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: actions/cache@v4
with:
path: ~/.cache/composer
key: composer-${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
- uses: ddev/github-action-setup-ddev@v1
- run: ddev start
- run: ddev composer install --no-interaction --prefer-dist
- run: ddev exec phpunit -c web/core

Benchmark script

examples/devops/benchmark-ddev-ci.sh

./examples/devops/benchmark-ddev-ci.sh \
  acme/drupal-platform \
  drupal-ci-github-hosted.yml \
  drupal-ci-warpbuild.yml \
  20

Cache strategy

Layer	Key strategy	Eviction/limit concern	Guardrail
Composer (actions/cache)	hashFiles('**/composer.lock')	GitHub cache quotas and eviction	Keep caches lockfile-scoped; no mutable keys
DDEV runtime warmup	Warm via ddev start + smoke	Cold starts on new runners	Track cold vs warm p95 separately
WarpBuild runner cache/snapshots	Prewarm common toolchain paths	Snapshot drift hides breakages	Weekly cold-run canary with snapshots disabled

Rollout flow

Rollout Guardrails

1. Shadow mode first: run WarpBuild workflow in parallel, but do not block merges for one week.
2. Promote only if p95 runtime improves by at least 20% and failure rate does not regress.
3. Keep one baseline GitHub-hosted workflow as a canary for two release cycles.

Performance comparison (expected)

Metric	GitHub-Hosted	WarpBuild (4x)	Delta
p50 runtime	~8-12 min	~4-7 min	-40-50%
p95 runtime	~15-20 min	~8-12 min	-40-50%
Cold start penalty	High	Medium	Improved
Cache hit rate	Depends on eviction	Higher with snapshots	Improved

Migration checklist

• Set up baseline GitHub-hosted workflow
• Collect 20 successful baseline runs
• Configure WarpBuild runner workflow
• Run WarpBuild in shadow mode for one week
• Collect 20 successful WarpBuild runs
• Compare p50, p95, and failure rates
• Promote to 25% PR coverage if guardrails met
• Roll out to 100% after stability confirmed
• Keep baseline canary running for two release cycles

Related reading

• DDEV v1.25 modular share architecture
• DDEV Podman/rootless constraints
• Composer path repo workflow for Drupal

Why this matters for Drupal and WordPress

Drupal CI pipelines running PHPUnit, Nightwatch, or Cypress through DDEV are the primary beneficiary of WarpBuild acceleration -- the Composer install and DDEV startup phases that dominate Drupal CI runtimes see the largest speedups. WordPress teams using DDEV for plugin or theme CI can apply the same workflow template by swapping phpunit -c web/core for their own test commands. The deterministic cache key strategy using composer.lock hashes works identically for both Drupal and WordPress Composer-managed projects, and the shadow-mode rollout approach prevents CI instability when switching runner platforms.

What I learned

• WarpBuild acceleration works best when compute and cache are tuned together; compute alone is not enough.
• Deterministic cache keys beat "mega-cache" strategies for Drupal reliability.
• A permanent baseline lane prevents overfitting CI to one runner platform.

References

• https://github.com/ddev/ddev/releases/tag/v1.25.1
• https://docs.ddev.com/
• https://www.warpbuild.com/docs/ci/quick-start
• https://www.warpbuild.com/docs/ci/features
• https://www.warpbuild.com/docs/ci/preinstalled-software
• https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows

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