ci: check dependency licences with cargo-deny on every pull request

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

.github/workflows/ci.yml

@@ -60,12 +60,6 @@ jobs:
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           save-if: ${{ github.ref == 'refs/heads/develop' }}
-      # A dependency update changes THIRD-PARTY-LICENSES.txt, which Dependabot cannot regenerate:
-      # regenerate it here so the gate checks everything else, and dependabot-licences.yml commits
-      # it to the pull request.
-      - name: Regenerate THIRD-PARTY-LICENSES.txt (Dependabot)
-        if: github.event.pull_request.user.login == 'dependabot[bot]'
-        run: cargo xtask licences
       - run: cargo xtask ci
 
   heavy:
@@ -120,7 +114,7 @@ jobs:
         run: git diff --exit-code docs/oracle.md
 
   advisories:
-    name: Dependency advisories and sources
+    name: Dependency licences, advisories and sources
     if: github.event.schedule != '41 4 * * 0' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository || github.event.pull_request.user.login == 'dependabot[bot]')
     runs-on: ubuntu-24.04
     timeout-minutes: 20
@@ -129,4 +123,4 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
       - name: Install cargo-deny
         run: cargo install cargo-deny --version 0.20.2 --locked
-      - run: cargo deny --locked check --warn unmaintained advisories bans sources
+      - run: cargo deny --locked check --warn unmaintained advisories bans licenses sources

.github/workflows/dependabot-licences.yml

@@ -1,40 +0,0 @@
-# Dependabot's Cargo updates change THIRD-PARTY-LICENSES.txt (`cargo xtask licences`), which
-# Dependabot cannot regenerate: this commits the regenerated file to its pull request. CI's own
-# run on the pull request regenerates it too, so its result covers everything else.
-name: Dependabot licences
-
-on:
-  pull_request:
-    branches: [develop]
-    paths: [Cargo.lock]
-
-permissions:
-  contents: write
-
-concurrency:
-  group: dependabot-licences-${{ github.head_ref }}
-  cancel-in-progress: true
-
-jobs:
-  licences:
-    if: github.event.pull_request.user.login == 'dependabot[bot]'
-    runs-on: ubuntu-24.04
-    timeout-minutes: 20
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          ref: ${{ github.head_ref }}
-      - uses: dtolnay/rust-toolchain@stable
-      - run: cargo xtask licences
-      - name: Commit the regenerated file
-        run: |
-          if git diff --quiet -- THIRD-PARTY-LICENSES.txt; then
-            echo "THIRD-PARTY-LICENSES.txt is up to date"
-            exit 0
-          fi
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-          # [skip ci]: the pull request's CI run already regenerated this file and tested the
-          # tree with it; a bot-authored commit would otherwise wait for a maintainer's approval.
-          git commit -m "deps: regenerate THIRD-PARTY-LICENSES.txt [skip ci]" -- THIRD-PARTY-LICENSES.txt
-          git push origin "HEAD:${GITHUB_HEAD_REF}"