CI: add OpenBSD workflow in openbsd.yml

.github/workflows/openbsd.yml

@@ -0,0 +1,73 @@
+name: CI OpenBSD
+
+on:
+  push:
+    branches: [ master ]
+    tags:
+    - '2.*'
+  pull_request:
+    branches: [ master ]
+    paths:
+    - '**.py'
+    - '**.pyx'
+    - '**.c'
+    - '**.h'
+    - '**.yml'
+    - '**.toml'
+    - '**.cfg'
+    - '**.ini'
+    - 'requirements.d/*'
+    - '!docs/**'
+
+jobs:
+  openbsd_tests:
+    name: OpenBSD tests
+    runs-on: ubuntu-24.04
+    timeout-minutes: 90
+    continue-on-error: true
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+      with:
+        # setuptools-scm needs full history for versioning
+        fetch-depth: 0
+        fetch-tags: true
+
+    - name: Run on OpenBSD
+      id: openbsd
+      uses: cross-platform-actions/action@v0.29.0
+      with:
+        operating_system: openbsd
+        version: '7.7'
+        shell: bash
+        cpu_count: 3
+        memory: 6G
+        run: |
+          set -euxo pipefail
+          # On OpenBSD, use pkg_add and set installurl. Use sudo for privileged operations.
+          # echo "https://ftp.eu.openbsd.org/pub/OpenBSD" | sudo tee /etc/installurl > /dev/null
+          # crypto / compression libs
+          sudo -E pkg_add xxhash || true
+          sudo -E pkg_add lz4 || true
+          sudo -E pkg_add zstd || true
+          # toolchain / VCS
+          sudo -E pkg_add git || true
+          sudo -E pkg_add rust || true
+          # OpenSSL 3.4
+          sudo -E pkg_add openssl%3.4 || true
+          # Python tooling
+          sudo -E pkg_add py3-pip || true
+          sudo -E pkg_add py3-virtualenv || true
+
+          export BORG_OPENSSL_NAME=eopenssl34
+          # Create and activate a virtualenv
+          python3 -m virtualenv .venv
+          . .venv/bin/activate
+          python -m pip install --upgrade pip
+          # Install development/test dependencies
+          pip install -r requirements.d/development.txt
+          # Build Borg (editable)
+          pip install -e .
+          # Run tests; skip benchmarks
+          pytest -v -n auto --benchmark-skip