Added Python package setup and version management

.gitattributes

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+artella/plugins/savetocloud/_version.py export-subst

.github/workflows/pythonrelease.yml

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+on:
+  push:
+    tags:
+      - "releases/[1-9]+.[0-9]+.[0-9]+!"
+    branches:
+      - "master"
+  create:
+    tags:
+      - "releases/[1-9]+.[0-9]+.[0-9]+!"
+    branches:
+      - "master"
+
+name: Create Release
+
+jobs:
+  build:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Create Release
+        if: startsWith( github.ref, 'refs/tags/releases/')
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          body: ${{ github.event.commits[0].message }}
+          draft: false
+          prerelease: false

MANIFEST.in

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+include versioneer.py
+include artella-plugin.json
+include artella/plugins/savetocloud/_version.py
+recursive-include artella/plugins/savetocloud/resources/* *.*
+recursive-exclude * *.py[co]

artella/plugins/savetocloud/__version__.py

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+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Version module for artella-plugins-savetocloud
+"""
+
+from __future__ import print_function, division, absolute_import
+
+__version__ = None
+
+
+def get_version():
+    global __version__
+    if __version__:
+        return __version__
+
+    from ._version import get_versions
+    __version__ = get_versions()['version']
+    del get_versions
+
+    return __version__