Upgrade deployment workflow

- Trigger on version change
- Create semver tag (with graceful fail)
- Include changelog in release

Author: moomoohk

.github/workflows/deploy.yml

@@ -2,10 +2,10 @@ name: Deploy and Release
 
 # Controls when the workflow will run
 on:
-  # Triggers the workflow on tag push
+  # Triggers the workflow on version change
   push:
-    tags:
-      - "v*"
+    paths:
+      - "dpath/version.py"
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
@@ -19,6 +19,32 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
+      - name: Get Version
+        id: get-version
+        run: |
+          python -c "from dpath.version import VERSION; print(f'::set-output name=version::v{VERSION}');"
+
+      - name: Check Tag
+        uses: mukunku/tag-exists-action@v1.0.0
+        id: check-tag
+        with:
+          tag: ${{ steps.get-version.outputs.version }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create Tag
+        if: ${{ steps.check-tag.outputs.exists }} == "false"
+        uses: negz/create-tag@v1
+        with:
+          version: ${{ steps.get-version.outputs.version }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate Changelog
+        id: generate-changelog
+        uses: loopwerk/tag-changelog@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
       - name: PyPI Deployment
         uses: casperdcl/deploy-pypi@v2
         with:
@@ -30,8 +56,10 @@ jobs:
           build: clean sdist -d dist/
           # `pip` command to run ("true" is a shortcut for "wheel -w <dist_dir> --no-deps .")
           pip: true
-          
+
       - name: Github Release
         uses: softprops/action-gh-release@v1
         with:
+          tag_name: ${{ steps.get-version.outputs.version }}
+          body: ${{ steps.generate-changelog.outputs.changes }}
           files: dist/*