ci: add auto semantic release

.github/workflows/semver.yml

@@ -0,0 +1,23 @@
+name: Semantic Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    concurrency: release
+    permissions:
+      contents: write
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Python Semantic Release
+      uses: relekang/python-semantic-release@master
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}

setup.cfg

@@ -0,0 +1,5 @@
+[semantic_release]
+upload_to_repository = false
+version_source = tag_only
+build_command = false
+upload_to_release = false