Correctly format github release. Update README for releasing

.github/workflows/main.yml

@@ -70,6 +70,16 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for sigstore
 
     steps:
+      - name: Check out the repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Fetch all tags and history
+      - name: Get tag annotation
+        id: tag_annotation
+        run: |
+          # Extract the tag annotation for release notes
+          tag_annotation=$(git for-each-ref --format '%(contents:body)' refs/tags/${{ github.ref_name }})
+          echo "annotation=$tag_annotation" >> $GITHUB_ENV
       - name: Download all the dists
         uses: actions/download-artifact@v4
         with:
@@ -88,7 +98,8 @@ jobs:
           gh release create
           '${{ github.ref_name }}'
           --repo '${{ github.repository }}'
-          --notes ""
+          --title '${{ github.ref_name }}'
+          --notes "${{ env.annotation }}"
       - name: Upload artifact signatures to GitHub Release
         env:
           GITHUB_TOKEN: ${{ github.token }}

README.md

@@ -94,6 +94,14 @@ To run tests in a venv: `make test` (not implemented yet)
 - Using `nix`:
     - `nix develop`: Provides development shell with all dependencies.
     - `make test` and `hatch build/publish` work as usual.
+- GitHub Action will upload to TestPyPi on each push to `main`. To create a
+  GitHub and PyPi release, create a new tag (formatting below) and push tags.
+
+        <tag name on first line>
+
+        * Release note 1
+        * Release note 2
+        * ...
 
 ## Planned features
 

pyproject.toml

@@ -31,6 +31,8 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Utilities",
 ]
 dependencies = [