Updated workflows.

- Added `create-release.yml` workflow.
- Renamed `pythonpackage.yml` to `test-package.yml`.

.github/workflows/create-release.yml

@@ -0,0 +1,29 @@
+name: Create release
+
+on:
+  push:
+    tags:
+      - '*.*.*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Extract release notes
+        id: extract-release-notes
+        uses: ffurrer2/extract-release-notes@v1
+
+      - name: Create release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: false
+          prerelease: false
+          body: ${{ steps.extract-release-notes.outputs.release_notes }}

.github/workflows/test-package.yml

@@ -1,4 +1,4 @@
-name: Python package
+name: Test package
 
 on:
   - push