Refresh and automate updating licenses list (#489)

.github/workflows/update_licenses.yml

@@ -0,0 +1,39 @@
+name: "Update licenses"
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 1 * *" # run once a month
+
+jobs:
+  update-licenses:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+
+      - name: Generate token
+        id: generate_token
+        uses: tibdex/github-app-token@v1
+        with:
+          app_id: ${{ secrets.POETRY_TOKEN_APP_ID }}
+          private_key: ${{ secrets.POETRY_TOKEN_APP_KEY }}
+
+      - name: Update licenses list
+        run: |
+          python src/poetry/core/spdx/helpers.py
+
+      - name: Create PR if necessary
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ steps.generate_token.outputs.token }}
+          commit-message: "Automated licenses list update"
+          author: "github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>"
+          branch: "license-autoupdate"
+          title: "Automated licenses list update"
+          body: "Full log: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"