Add a workflow for automated backporting

.github/workflows/backport.yaml

@@ -0,0 +1,38 @@
+name: Backport Bug Fixes
+on:
+  schedule:
+    # Run weekdays 12:00 on main branch, so that it doesn't wreak havoc on
+    # weekends.
+    - cron: '0 12 * * 1-5'
+  workflow_dispatch:
+  push:
+    branches:
+      # You can run and debug new versions of the backport script by pushing it
+      # to this branch. workflow_dispatch can only be run through github cli for
+      # branches that are not main, so it's inconvenient.
+      - backport/trigger
+
+jobs:
+  backport:
+    name: Backport Bug Fixes
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install Linux Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install pip
+
+      - name: Install Python Dependencies
+        run: |
+          pip install PyGithub requests
+
+      - name: Checkout TimescaleDB
+        uses: actions/checkout@v3
+
+      - name: Run the Backport Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ORG_AUTOMATION_TOKEN }}
+        run: |
+          git remote --verbose
+          scripts/backport.py

.github/workflows/changelog-check.yaml

@@ -2,7 +2,10 @@ name: Check CHANGELOG.md updated
 "on":
   pull_request:
     types: [opened, synchronize, reopened, edited]
-    branches: [main]
+    # It's important to check that the changelog is updated with bug fixes that
+    # we backport to the release branches, so these branches are included as
+    # well.
+    branches: [main, "[0-9]+.[0-9]+.x"]
 jobs:
   # Check that the CHANGELOG is updated by the pull request. This can be
   # disabled by adding a trailer line of the following form to the

.github/workflows/code_style.yaml

@@ -85,7 +85,7 @@ jobs:
           pip install --upgrade pip
           # Inexplicably, at some point pip started to insist on installing
           # prospector==1.7.7, which is incompatible with the new pylint.
-          pip install black prospector==1.8.4 psutil pylint
+          pip install black prospector==1.8.4 psutil pylint pygithub
           pip list
           pip list --user
       - name: Checkout source

.pull-review

@@ -57,10 +57,13 @@ reviewers:
 review_blacklist:
   - horzsolt
 
-# ignore changes to the test output files. 
+# ignore changes to the test output files.
 # 1. because they usually will have equivalent .sql files
 # 2. because people that modify a test, don't necessarily change the same c-functionality at all
 # so tests should be less important than C files
 file_blacklist:
   - tsl/test/expected/*.out
   - test/expected/*.out
+
+label_blacklist:
+  - pr-backport