Install deps for release workflow

Author: vivekjoshy

.github/workflows/release.yml

@@ -34,8 +34,8 @@ jobs:
       - name: Check Version
         id: check-version
         run: |
-          [[ "$(python -c "import openskill; print(openskill.__version__)")" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] \
-            || echo "prerelease=true" >> $GITHUB_OUTPUT
+            pip install -e .
+            [[ "$(python -c "import openskill; print(openskill.__version__)")" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || echo "prerelease=true" >> $GITHUB_OUTPUT
       - name: Create Release
         uses: ncipollo/release-action@v1
         with: