Automatically publish a main brach that is like the master branch (#1724)

... but with the history fixed

.github/workflows/publish-main.yml

@@ -0,0 +1,42 @@
+name: Publish main branch
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  publish-main:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Fetch all history
+      
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      
+      - name: Install dulwich
+        run: |
+          pip install -e .
+      
+      - name: Delete existing main branch if present
+        run: |
+          if git show-ref --verify refs/heads/main; then
+            git branch -D main
+          fi
+      
+      - name: Run fix-history script
+        run: |
+          python devscripts/fix-history.py master main
+      
+      - name: Push main branch
+        run: |
+          git push origin main --force