From 81a161d433569c3e2acc501c068042d8b64d5212 Mon Sep 17 00:00:00 2001
From: j4n <j4n@systemli.org>
Date: Tue, 28 Apr 2026 07:39:48 +0200
Subject: [PATCH] feat(ci): add repository_dispatch trigger to chatmail/docker

On push to main send a repository_dispatch event to chatmail/docker with
relay_ref, relay_sha, and relay_sha_short.

This triggers docker-ci.yaml to build a new Docker image from
the updated relay code, push to GHCR, and eventually run integration
tests via cmlxc's reusable lxc-test workflow.

Requires DOCKER_DISPATCH_TOKEN secret with repo scope on
chatmail/docker.

Also set workflow_dispatch to allow manual triggering of Docker builds
from any relay branch via the GitHub UI.
---
 .github/workflows/docker-dispatch.yaml | 37 ++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 .github/workflows/docker-dispatch.yaml

diff --git a/.github/workflows/docker-dispatch.yaml b/.github/workflows/docker-dispatch.yaml
new file mode 100644
index 00000000..3d275643
--- /dev/null
+++ b/.github/workflows/docker-dispatch.yaml
@@ -0,0 +1,37 @@
+# Notify the docker repo to build and test a new image after relay CI passes.
+#
+# Sends a repository_dispatch event to chatmail/docker with the relay ref
+# and short SHA, which triggers docker-ci.yaml to build, push to GHCR,
+# and run integration tests via cmlxc.
+
+name: Trigger Docker build
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  dispatch:
+    name: Dispatch build to chatmail/docker
+    runs-on: ubuntu-latest
+    if: github.repository == 'chatmail/relay'
+    steps:
+      - name: Compute short SHA
+        id: sha
+        run: echo "short=$(echo '${{ github.sha }}' | cut -c1-7)" >> "$GITHUB_OUTPUT"
+
+      - name: Send repository_dispatch
+        uses: peter-evans/repository-dispatch@ff45666b9427631e3450c54a1bcbee4d9ff4d7c0 # v3
+        with:
+          token: ${{ secrets.CHATMAIL_DOCKER_DISPATCH_TOKEN }}
+          repository: chatmail/docker
+          event-type: relay-updated
+          client-payload: >-
+            {
+              "relay_ref": "${{ github.ref_name }}",
+              "relay_sha": "${{ github.sha }}",
+              "relay_sha_short": "${{ steps.sha.outputs.short }}"
+            }