Coordinators now dispatch per-OS builds via API

Previously per-OS build workflows triggered on tag push events, but
Gitea doesn't fire events for tags pushed by other workflows. Now:

- release.yml dispatches build-app-{linux,windows,macos}.yml via
  the Gitea API after creating the tag and release
- sidecar-release.yml dispatches build-sidecar-{linux,windows,macos}.yml

Per-OS workflows changed from push+dispatch triggers to dispatch-only
with tag as a required input. To re-run a failed build for the same
version, just dispatch the specific OS workflow with the same tag --
upload logic replaces existing assets automatically.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/sidecar-release.yml

@@ -28,12 +28,10 @@ jobs:
       - name: Check for backend changes
         id: check_changes
         run: |
-          # If triggered by workflow_dispatch, always build
           if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
             echo "has_changes=true" >> $GITHUB_OUTPUT
             exit 0
           fi
-          # Check if relevant files changed in this commit
           CHANGED=$(git diff --name-only HEAD~1 HEAD -- client/ server/ backend/ pyproject.toml local-transcription-headless.spec 2>/dev/null || echo "")
           if [ -n "$CHANGED" ]; then
             echo "has_changes=true" >> $GITHUB_OUTPUT
@@ -53,11 +51,9 @@ jobs:
         if: steps.check_changes.outputs.has_changes == 'true'
         id: bump
         run: |
-          # Read current version from pyproject.toml
           CURRENT=$(grep '^version = ' pyproject.toml | head -1 | sed 's/version = "\(.*\)"/\1/')
           echo "Current sidecar version: ${CURRENT}"
 
-          # Increment patch number
           MAJOR=$(echo "${CURRENT}" | cut -d. -f1)
           MINOR=$(echo "${CURRENT}" | cut -d. -f2)
           PATCH=$(echo "${CURRENT}" | cut -d. -f3)
@@ -65,10 +61,7 @@ jobs:
           NEW_VERSION="${MAJOR}.${MINOR}.${NEW_PATCH}"
           echo "New sidecar version: ${NEW_VERSION}"
 
-          # Update pyproject.toml
           sed -i "s/^version = \"${CURRENT}\"/version = \"${NEW_VERSION}\"/" pyproject.toml
-
-          # Update version.py
           sed -i "s/__version__ = \"${CURRENT}\"/__version__ = \"${NEW_VERSION}\"/" version.py
           sed -i "s/__version_info__ = .*/__version_info__ = (${MAJOR}, ${MINOR}, ${NEW_PATCH})/" version.py
 
@@ -107,3 +100,21 @@ jobs:
             -d "{\"tag_name\": \"${TAG}\", \"name\": \"${RELEASE_NAME}\", \"body\": \"Automated sidecar build.\", \"draft\": false, \"prerelease\": false}" \
             "${REPO_API}/releases"
           echo "Created release: ${RELEASE_NAME}"
+
+      - name: Trigger per-OS sidecar builds
+        if: steps.check_changes.outputs.has_changes == 'true'
+        env:
+          BUILD_TOKEN: ${{ secrets.BUILD_TOKEN }}
+        run: |
+          REPO_API="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+          TAG="${{ steps.bump.outputs.tag }}"
+
+          for workflow in build-sidecar-linux.yml build-sidecar-windows.yml build-sidecar-macos.yml; do
+            echo "Dispatching ${workflow} for ${TAG}..."
+            HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
+              -H "Authorization: token ${BUILD_TOKEN}" \
+              -H "Content-Type: application/json" \
+              -d "{\"ref\": \"main\", \"inputs\": {\"tag\": \"${TAG}\"}}" \
+              "${REPO_API}/actions/workflows/${workflow}/dispatches")
+            echo "  -> HTTP ${HTTP_CODE}"
+          done