ci(ingest): open the weekly ingest PR against TechAPI develop

weekly-ingest was the last automation still targeting main. TechAPI
follows git-flow — pushing to main deploys the site and notifies
TechEngine — so a 6,900-file data PR landing there bypasses the
release gate that every other data path goes through.

The checkout already resolved to develop implicitly (it is the default
branch); pin it explicitly so the base and the branch point cannot
drift apart if the default changes again.

Refs #1

Author: Seungpyo1007

.github/workflows/weekly-ingest.yml

@@ -42,6 +42,9 @@ jobs:
         with:
           repository: GetTechAPI/TechAPI
           path: TechAPI
+          # TechAPI follows git-flow: ingest is integration work, so branch from
+          # develop and open the PR there. main only moves through a release PR.
+          ref: develop
           token: ${{ secrets.TECHENGINEBOT_TOKEN || secrets.TECHAPI_TOKEN || secrets.GITHUB_TOKEN }}
 
       - uses: actions/setup-python@v6
@@ -134,6 +137,6 @@ jobs:
           gh pr create \
             --title "feat(data/${CATEGORY}): weekly ingest" \
             --body-file ../pr-body.md \
-            --base main \
+            --base develop \
             --head "$BRANCH" \
             $DRAFT_FLAG