ci: take the release notes from the changelog

.github/workflows/release.yml

@@ -33,6 +33,10 @@ jobs:
       - name: Check the tag against the Makefile
         run: packaging/check-version.sh "${{ github.ref_name }}"
 
+      - name: Check CHANGELOG.md has this release
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: .github/release-notes.sh --title "${{ github.ref_name }}"
+
       - run: packaging/build-deb.sh
 
       - name: Look inside what was built
@@ -106,6 +110,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
+        with:
+          # All tags, for the link to the changes since the last release.
+          fetch-depth: 0
 
       - uses: actions/download-artifact@v8
         with:
@@ -117,9 +124,10 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
+          .github/release-notes.sh "${{ github.ref_name }}" > notes.md
           gh release create "${{ github.ref_name }}" \
-            --title "${{ github.ref_name }}" \
-            --generate-notes \
+            --title "$(.github/release-notes.sh --title "${{ github.ref_name }}")" \
+            --notes-file notes.md \
             incoming/*.deb incoming/*.rpm \
           || gh release upload "${{ github.ref_name }}" \
             incoming/*.deb incoming/*.rpm --clobber

packaging/README.md

@@ -29,12 +29,14 @@ argument.
 ## Making a release
 
 1. Bump `VERSION` in the Makefile.
-2. Commit, then `git tag vX.Y.Z && git push --tags`.
+2. Add the release to `CHANGELOG.md`, in the format CLAUDE.md describes.
+3. Commit, then `git tag vX.Y.Z && git push --tags`.
 
 The `release` workflow builds both packages in a Debian and a Fedora container,
-refuses the tag if it disagrees with the Makefile, attaches the packages to a
-GitHub release, and adds them to the APT and RPM repositories on the `gh-pages`
-branch. Nothing else has to be done by hand.
+refuses the tag if it disagrees with the Makefile or has no changelog entry,
+attaches the packages to a GitHub release with the entry as its notes, and adds
+them to the APT and RPM repositories on the `gh-pages` branch. Nothing else has
+to be done by hand.
 
 ## Trying the release path first