fix: auto release on mirror updates (#8)

As mentioned in astral-sh/ruff-pre-commit#82 /
astral-sh/ruff-pre-commit#83, the auto release
function doesn't work. This fixes that by checking for changes and
setting a flag. If the flag is set, it will also create a new release
through gh cli.

Another note is that the `actions/setup-python` is updated from `v4` →
`v5`
 
This is being done now because it has been working well for the
ruff-pre-commit repo (I think?)

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
           cache: pip
@@ -31,6 +31,32 @@ jobs:
 
       - run: python mirror.py
 
-      - run: |
+      - name: check for unpushed commits
+        id: check_unpushed
+        run: |
+          UNPUSHED_COMMITS=$(git log origin/main..HEAD)
+          if [ -z "$UNPUSHED_COMMITS" ]; then
+            echo "No unpushed commits found."
+            echo "changes_exist=false" >> $GITHUB_ENV
+          else
+            echo "Unpushed commits found."
+            echo "changes_exist=true" >> $GITHUB_ENV
+          fi
+
+      - name: push changes if they exist
+        if: env.changes_exist == 'true'
+        run: |
           git push origin HEAD:refs/heads/main
           git push origin HEAD:refs/heads/main --tags
+
+      - name: create release on new tag if new changes exist
+        if: env.changes_exist == 'true'
+        run: |
+          TAG_NAME=$(git describe --tags $(git rev-list --tags --max-count=1))
+          echo $TAG_NAME
+          gh release create "$TAG_NAME" \
+            --title "$TAG_NAME" \
+            --notes "See: https://github.com/astral-sh/uv/releases/tag/$TAG_NAME" \
+            --latest
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}