From be4e77c13697a37668998c5846b85e8104f1d6fb Mon Sep 17 00:00:00 2001
From: Carl Bennett <carl@carlbennett.me>
Date: Fri, 20 Mar 2026 13:22:52 -0500
Subject: [PATCH] fix: trigger docker-build workflow after GITHUB_TOKEN push
 from update.yml

GITHUB_TOKEN pushes do not trigger downstream workflows, so docker-build.yml
never fires after update.yml commits a new version. Add a workflow_run trigger
so docker-build runs after Check Update completes.

A change-detection step skips the build when triggered via workflow_run but
buildinfo.json was not modified, avoiding spurious builds on every hourly run.

References #604

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .github/workflows/docker-build.yml | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index 08593067..cb570ae8 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -6,7 +6,13 @@ on:
       - master
     paths:
       - buildinfo.json
-  # workaround for #526
+  # workflow_run is used because GITHUB_TOKEN pushes from update.yml don't trigger push events
+  workflow_run:
+    workflows: ["Check Update"]
+    types:
+      - completed
+    branches:
+      - master
   workflow_dispatch:
 
 jobs:
@@ -16,12 +22,25 @@ jobs:
 
       - name: Checkout
         uses: actions/checkout@v6
+        with:
+          fetch-depth: 2
+
+      - name: Check if buildinfo.json changed
+        id: check
+        if: github.event_name == 'workflow_run'
+        run: |
+          if git diff --name-only HEAD~1 HEAD | grep -q '^buildinfo.json$'; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "changed=false" >> $GITHUB_OUTPUT
+          fi
 
       - name: Set up QEMU
+        if: github.event_name != 'workflow_run' || steps.check.outputs.changed == 'true'
         uses: docker/setup-qemu-action@v3
 
       - name: build and push all images
-        if: ${{ env.DOCKER_USERNAME != '' && env.DOCKER_PASSWORD != '' }}
+        if: (github.event_name != 'workflow_run' || steps.check.outputs.changed == 'true') && env.DOCKER_USERNAME != '' && env.DOCKER_PASSWORD != ''
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}