Add gh workflow for creating translations PR

.github/workflows/create-translations-pr.yml

@@ -0,0 +1,56 @@
+name: Create Translations PR
+
+on:
+  workflow_dispatch:
+    inputs:
+      language_code:
+        description: 'Crowdin language code for the language of interest'
+        required: true
+
+jobs:
+  create-translations-pr:
+    runs-on: ubuntu-latest
+    # Run only on main branch in upstream repo.
+    if: ${{ github.repository == 'numpy/numpy.org' && github.ref == 'refs/heads/main' }}
+    steps:
+      - name: Checkout numpy.org
+        uses: actions/checkout@v4
+        with:
+          repository: 'numpy/numpy.org'
+          path: 'numpy.org'
+          ref: 'main'
+          fetch-depth: 0  # Gets full github history.
+          # Full history is needed for the scripted interactive rebase
+          # which takes place in create_branch_for_language.sh below.
+
+      - name: Checkout scientific-python-translations automations
+        uses: actions/checkout@v4
+        with:
+          repository: 'scientific-python-translations/automations'
+          path: 'automations'
+          ref: 'main'
+
+      - name: Create translations branch for language of interest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git config --global user.email "[email protected]"
+          git config --global user.name "GitHub Actions"
+          ../automations/scripts/create_branch_for_language.sh origin main l10n_main ${{ github.event.inputs.language_code }}
+          branch_name=$(git rev-parse --abbrev-ref HEAD)
+          git push -u origin $branch_name
+          echo "BRANCH_NAME=$branch_name" >> $GITHUB_ENV
+        working-directory: ./numpy.org
+
+      - name: Create Pull Request
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          language_name=$(../automations/scripts/get_language_name.sh ${{ github.event.inputs.language_code }})
+          gh pr create --base main --head ${{ env.BRANCH_NAME }} --title "Update translations for $language_name" \
+          --body "This PR to update translations for $language_name was generated by the GitHub workflow, \
+          auto-translations-pr.yml and includes all commits from this repo's Crowdin branch for the language \
+          of interest. A final check of the rendered docs is needed to identify if there are any formatting \
+          errors due to incorrect string segmentation by Crowdin. If there are such formatting errors, they \
+          should be fixed directly on this branch, not through Crowdin."
+        working-directory: ./numpy.org