docs: add AGENTS.md for opencode context

AGENTS.md

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+# pipeline-actions — Agent Guide
+
+## Overview
+
+This repo provides reusable Gitea composite actions for homelab CI/CD pipelines. Actions are consumed by other projects via `uses: ivanch/pipeline-actions/<action>@main`.
+
+## Actions
+
+### `build-and-push` (`build-and-push/action.yaml`)
+
+Logs into the container registry, sets up SSH key for `docker-build.haven`, creates a remote Buildx context over SSH, and builds + pushes a multi-arch Docker image.
+
+**Inputs:**
+- `image` (required) — full image ref without tag (`:latest` appended)
+- `registry_password` (required) — registry password/token (use secrets)
+- `ssh_key` (required) — SSH private key for remote builder (use secrets)
+- `registry_host` (default `git.ivanch.me`) — container registry hostname
+- `registry_username` (default `ivanch`) — registry username
+- `platforms` (default `linux/amd64,linux/arm64`) — target build platforms
+- `build_context` (default `.`) — Docker build context path
+- `build_dockerfile` (default `Dockerfile`) — Dockerfile path relative to context
+- `docker_host` (default `docker-build.haven`) — remote builder hostname
+- `docker_user` (default `root`) — SSH user for remote builder
+
+### `deploy-restart` (`deploy-restart/action.yaml`)
+
+Validates `KUBE_CONFIG`, installs kubectl, and performs `rollout restart` of a Kubernetes Deployment.
+
+**Inputs:**
+- `kube_config` (required) — full kubeconfig YAML (use secrets)
+- `deployment_name` (required) — Deployment name to restart
+- `namespace` (default `default`) — Kubernetes namespace
+- `kube_version` (default `stable`) — kubectl version to download
+
+## Workflow Template for New Projects
+
+When wiring up CI/CD for a new homelab project, create `.gitea/workflows/main.yaml`:
+
+```yaml
+name: Build and Deploy (internal)
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch: {}
+
+env:
+  IMAGE: git.ivanch.me/ivanch/<PROJECT_NAME>
+
+jobs:
+  build:
+    name: Build Image
+    runs-on: ubuntu-amd64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ivanch/pipeline-actions/build-and-push@main
+        with:
+          image: ${{ env.IMAGE }}
+          registry_password: ${{ secrets.REGISTRY_PASSWORD }}
+          ssh_key: ${{ secrets.SSH_KEY_DOCKERBUILD }}
+
+  deploy:
+    name: Deploy (internal)
+    runs-on: ubuntu-amd64
+    needs: build
+    steps:
+      - uses: ivanch/pipeline-actions/deploy-restart@main
+        with:
+          kube_config: ${{ secrets.KUBE_CONFIG }}
+          deployment_name: <DEPLOYMENT_NAME>
+          namespace: <NAMESPACE>
+```
+
+## Required Secrets
+
+Consumer projects must set these secrets in Gitea repo settings (Settings → Actions → Secrets):
+
+| Secret | Purpose |
+|---|---|
+| `REGISTRY_PASSWORD` | Container registry password/token for `git.ivanch.me` |
+| `SSH_KEY_DOCKERBUILD` | SSH private key for `root@docker-build.haven` |
+| `KUBE_CONFIG` | Full kubeconfig YAML for k8s cluster access |
+
+## Rules
+
+- Pin composite action refs to `@main` until version tags are created.
+- Always use `runs-on: ubuntu-amd64` (homelab Gitea runner label).
+- Always build `linux/amd64,linux/arm64` — the cluster has mixed arch (iris+vega=amd64, nebula+nexus=arm64).
+- Workflow files go in `.gitea/workflows/main.yaml` of the consuming project.
+- The consuming project must have a working `Dockerfile` at the repo root (or pass `build_dockerfile` input).
+
+## Do Not
+
+- Do not add GitHub Actions workflows — these are Gitea composite actions only.
+- Do not hardcode secrets in workflow files — always use `${{ secrets.* }}`.
+- Do not override `platforms` to a single arch unless there's a specific reason.
+- Do not vendor dependencies — consumers reference this repo via `uses:`.