Fix launchpad upload

Use a pip installed breezy and apply patches to make it work.
The first is a bug in the code (missing import) the 2nd an
incompatibility with Python3 where `sys.stdin` is a string buffer while
a byte buffer is expected. `sys.stdin.buffer` can be used for that as
done in later breezy versions.

Author: Flamefire

.github/workflows/synchronize-launchpad.yml

@@ -11,12 +11,22 @@ on:
 
 jobs:
   upload:
-    runs-on: ubuntu-22.04  # We need bzr < 3.3 for non-interactive login
+    runs-on: ubuntu-latest
     steps:
       - name: Install dependencies
         run: |
-          sudo apt-get -o Acquire::Retries=3 update
-          sudo apt-get -o Acquire::Retries=3 install -y openssh-client git bzr-fastimport
+          venv_dir="/tmp/venv"
+          python -m venv "$venv_dir"
+          . $venv_dir/bin/activate
+          echo "VIRTUAL_ENV=$VIRTUAL_ENV" >> "$GITHUB_ENV"
+          echo "$venv_dir/bin" >> "$GITHUB_PATH"
+          pip install Cython configobj 'pip<23.1'  # Use a pip version that still allows the legacy installation for this breezy version
+          pip install 'breezy[fastimport,git,launchpad]<3.3'  # 3.3+ requires interactive login
+          fastimport_dir=$venv_dir/lib/python*/site-packages/breezy/plugins/fastimport
+          # Add missing import and use binary buffer of stdin for Python3 compat
+          sed -i '1 i from breezy import controldir' $fastimport_dir/branch_updater.py
+          sed -i 's/helpers.binary_stream(sys.stdin)/sys.stdin.buffer/' $fastimport_dir/cmds.py
+
 
       - uses: actions/checkout@v4
         with:
@@ -30,12 +40,12 @@ jobs:
 
       - name: Synchronize bazaar and git
         run: |
-          bzr init-repo bzr-repo
-          (cd "$GITHUB_WORKSPACE" && git fast-export -M --all) | (cd bzr-repo && bzr fast-import -)
+          brz init-repo bzr-repo
+          (cd "$GITHUB_WORKSPACE" && git fast-export -M --all) | (cd bzr-repo && brz fast-import -)
 
       - name: Login to launchpad
-        run: bzr launchpad-login ${{ secrets.LAUNCHPAD_USER }}
+        run: brz launchpad-login ${{ secrets.LAUNCHPAD_USER }}
 
       - name: Upload to launchpad
         working-directory: bzr-repo/trunk
-        run: bzr push --overwrite lp:~s25rttrteam/s25rttr/s25rttr-languages
+        run: brz push --overwrite lp:~s25rttrteam/s25rttr/s25rttr-languages