feat(ci): trigger RC build on PR draft to main, rename branch to rc

When a PR is opened or drafted targeting main, the pre-release workflow
now automatically builds a release-candidate package and renames the
source branch to 'rc'.

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

.mokogitea/workflows/pre-release.yml

@@ -14,9 +14,10 @@ name: "Universal: Pre-Release"
 
 on:
   pull_request:
-    types: [closed]
+    types: [opened, ready_for_review, closed]
     branches:
       - dev
+      - main
   workflow_dispatch:
     inputs:
       stability:
@@ -39,11 +40,12 @@ env:
 
 jobs:
   build:
-    name: "Build Pre-Release (${{ inputs.stability || 'development' }})"
+    name: "Build Pre-Release (${{ inputs.stability || (github.event.pull_request.base.ref == 'main' && 'release-candidate') || 'development' }})"
     runs-on: release
     if: >-
       github.event_name == 'workflow_dispatch' ||
-      (github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'dev')
+      (github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'dev') ||
+      (github.event.action != 'closed' && github.event.pull_request.base.ref == 'main')
 
     steps:
       - name: Checkout
@@ -73,10 +75,35 @@ jobs:
         run: |
           php ${MOKO_CLI}/manifest_read.php --path . --github-output
 
+      - name: Rename branch to rc on PR draft to main
+        if: >-
+          github.event.action != 'closed' &&
+          github.event.pull_request.base.ref == 'main'
+        run: |
+          HEAD_BRANCH="${{ github.event.pull_request.head.ref }}"
+          if [ "$HEAD_BRANCH" != "rc" ]; then
+            git config --local user.email "gitea-actions[bot]@mokoconsulting.tech"
+            git config --local user.name "gitea-actions[bot]"
+            git remote set-url origin "https://x-access-token:${{ secrets.MOKOGITEA_TOKEN }}@git.mokoconsulting.tech/${{ github.repository }}.git"
+            git checkout -b rc
+            git push origin rc 2>&1 || true
+            # Update PR head branch via API
+            curl -s -X PATCH \
+              -H "Authorization: token ${{ secrets.MOKOGITEA_TOKEN }}" \
+              -H "Content-Type: application/json" \
+              -d "{\"head\": \"rc\"}" \
+              "${GITEA_URL}/api/v1/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}" || true
+          fi
+
       - name: Resolve metadata and bump version
         id: meta
         run: |
-          STABILITY="${{ inputs.stability || 'development' }}"
+          # Auto-detect RC when PR targets main
+          if [ "${{ github.event.pull_request.base.ref }}" = "main" ] && [ "${{ github.event.action }}" != "closed" ]; then
+            STABILITY="release-candidate"
+          else
+            STABILITY="${{ inputs.stability || 'development' }}"
+          fi
 
           case "$STABILITY" in
             development)        SUFFIX="-dev";   TAG="development" ;;
@@ -142,7 +169,7 @@ jobs:
           php ${MOKO_CLI}/release_create.php \
             --path . --version "$VERSION" --tag "$TAG" \
             --token "${{ secrets.MOKOGITEA_TOKEN }}" --api-base "$API_BASE" \
-            --repo "${GITEA_REPO}" --branch dev --prerelease
+            --repo "${GITEA_REPO}" --branch "${{ github.ref_name }}" --prerelease
 
       - name: Build package and upload
         id: package