Add major-minor-release workflow

.github/workflows/publish-major-minor.py

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+import sys
+
+from packaging.version import parse
+
+print(sys.version_info)
+tag_ref = sys.argv[1]
+tag_name = tag_ref.split("/")[-1]
+print(f"tag_name: {tag_name}")
+version = parse(tag_name)
+print(f"version: {version}")
+if not (version.is_prerelease):
+    print("Creating new major and minor tags!")
+    print(f"::set-output name=original_tag_name::{tag_name}")
+    print(f"::set-output name=major_version::v{version.major}")
+    print(f"::set-output name=minor_version::v{version.major}.{version.minor}")
+else:
+    print("No tags created (dev or pre version)!")

.github/workflows/publish-major-minor.yml

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+name: "Publish Major-Minor-Tags"
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  push-tags:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install packaging
+        run: pip install -U packaging
+      - name: Get versions
+        id: get_versions
+        run: python .github/workflows/publish-major-minor.py ${{ github.ref }}
+      - name: Push Tags Version
+        if: steps.get_versions.outputs.original_tag_name != ''
+        env:
+          original_tag_name: ${{ steps.get_versions.outputs.original_tag_name }}
+          major_version: ${{ steps.get_versions.outputs.major_version }}
+          minor_version: ${{ steps.get_versions.outputs.minor_version }}
+        run: |
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+          git config --global user.name "github-actions[bot]"
+          git tag -a $major_version -m "original tag: $original_tag_name"
+          git tag -a $minor_version -m "original tag: $original_tag_name"
+          git push origin $major_version -f
+          git push origin $minor_version -f