bump version refs to v0.40.0

[tillkruss]

Bumps the pinned Relay version from v0.30.0 to v0.40.0.

• ARG RELAY=v0.40.0 in the 17 Dockerfiles that pin a release
• .github/workflows/docker.yml: artifact build matrix version and RELAY_VERSION (used for the pie-latest build arg and the version verification step)

Untouched on purpose:

• docker/pie/pie-pinned.Dockerfile — deliberately pins an old version (0.20.0) to exercise PIE version pinning; the workflow skips version verification for it
• docker/README.md — RELAY=v0.9.1 is an illustrative example, not a pin
• benchmarks/release-v0.30.0-* — historical charts for that release

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the Docker build/test surface to use Relay v0.40.0 instead of v0.30.0, ensuring the pinned Docker images and the CI workflow matrix/verification are aligned on the new release tag.

Changes:

• Bumped ARG RELAY from v0.30.0 to v0.40.0 across the pinned Dockerfiles used in the build matrix.
• Updated .github/workflows/docker.yml to build artifacts for v0.40.0 and to verify packaged images against RELAY_VERSION=v0.40.0.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docker/ubuntu/ubuntu24.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/ubuntu/ubuntu24-zend.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/ubuntu/ubuntu20.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/sle15.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/mint21.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/litespeed/openlitespeed.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/litespeed/litespeed.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/frankenphp.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/el9/el9.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/debian/debian11.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/centos8/rocky8.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/centos8/centos8.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/centos7/centos7.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/arch.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/alpine.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/al2023.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
docker/al2.Dockerfile	Bump pinned ARG RELAY to v0.40.0.
.github/workflows/docker.yml	Update artifact matrix version and RELAY_VERSION to v0.40.0 for build args + version verification.

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