Add automatic release structure

.github/workflows/release.yml

@@ -0,0 +1,60 @@
+name: Cut release automatically
+
+on:
+  schedule:
+    - cron: "0 16 * * 2"
+
+jobs:
+  check-changes:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: master
+      - name: Check commits since last release
+        id: count-commits
+        run: |
+          git fetch --depth=1 origin +refs/tags/*:refs/tags/*
+          commits_since=$(git log $(git describe --tags --always --abbrev=0)..HEAD --oneline | wc -l)
+          echo "Commits since last release: $commits_since"
+          if [ "${commits_since}" == "0" ]; then
+            echo "No release needed"
+            exit 1
+          else
+            echo "Release needed"
+          fi
+
+  bump-and-pull-request:
+    needs: check-changes
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: master
+      - name: Bump version
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.x'
+      - run: |
+          pip install -r $GITHUB_WORKSPACE/requirements/release.txt
+          newver=$(bumpversion --dry-run --list patch | grep new_version= | sed -r s,"^.*=",,)
+          echo "::set-env name=NEW_VERSION::$newver"
+          echo "New version will be ${{ env.NEW_VERSION }}"
+          bumpversion patch
+      - name: Create Pull Request
+        id: cpr
+        uses: peter-evans/create-pull-request@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: autorelease/${{ env.NEW_VERSION }}
+          commit-message: Release version ${{ env.NEW_VERSION }}
+          title: Release version ${{ env.NEW_VERSION }}
+          body: This is an automated release that updates dependencies.
+      - name: Show outputs
+        run: |
+          echo "Pull Request Number - ${{ steps.cpr.outputs.pr_number }}"

.mergify.yml

@@ -1,5 +1,5 @@
 pull_request_rules:
-  - name: automatic approve dependabot pull requests
+  - name: automatically approve dependabot pull requests
     conditions:
       - author~=dependabot\[bot\]|dependabot-preview\[bot\]
       - status-success=continuous-integration/appveyor/branch
@@ -10,10 +10,28 @@ pull_request_rules:
       review:
         type: APPROVE
 
-  - name: automatic merge for dependabot pull requests
+  - name: automatically merge dependabot pull requests
     conditions:
       - author~=dependabot\[bot\]|dependabot-preview\[bot\]
       - "#approved-reviews-by>=1"
     actions:
       merge:
         method: merge
+
+pull_request_rules:
+  - name: automatically approve gha-bot pull requests
+    conditions:
+      - author~=github-actions\[bot\]
+      - status-success=continuous-integration/appveyor/pr
+      - status-success=continuous-integration/travis-ci/pr
+    actions:
+      review:
+        type: APPROVE
+
+  - name: automatically merge gha-bot pull requests
+    conditions:
+      - author~=github-actions\[bot\]
+      - "#approved-reviews-by>=1"
+    actions:
+      merge:
+        method: merge

requirements/release.txt

@@ -0,0 +1,2 @@
+pip==20.0.2
+bumpversion==0.5.3