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Add CI workflow for building and publishing Kubernetes Agent Docker images and Helm chart

Placeholder Copilot requested to merge copilot/add-kubernetes-agent-workflow into main

Migrates the Kubernetes Agent build pipeline from TeamCity to GitHub Actions. Builds three multi-arch Docker images in parallel, creates manifests, and publishes a Helm chart to OCI registry.

Workflow structure

build-publish-kubernetes-agent.yml
├── resolve-tag          ← GitVersion (identical to build-api-docker.yml)
├── build-tentacle       ← squid-tentacle    (amd64 + arm64 matrix)
├── build-watchdog       ← squid-watchdog    (amd64 + arm64 matrix)
├── build-nfs-server     ← nfs-server        (amd64 + arm64 matrix)
├── manifest             ← multi-arch manifest for all three images
└── helm                 ← helm package + push to OCI registry

Key decisions

  • Separate credentials: Uses SQUID_DOCKER_USERNAME / SQUID_DOCKER_PASSWORD / SQUID_DOCKER_HUB — distinct from the API workflow's DOCKER_* since these push to a different Docker Hub org
  • Version consistency: resolve-tag is identical to build-api-docker.yml (GitVersion 6.x fullSemVer, + → - replacement)
  • Chart packaging: Copies chart to /tmp before sed-ing version/appVersion to avoid mutating the working tree

Required repository configuration

Type Name Purpose
Variable SQUID_DOCKER_HUB Docker Hub org/namespace for agent images
Secret SQUID_DOCKER_USERNAME Docker Hub username
Secret SQUID_DOCKER_PASSWORD Docker Hub password/token

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