Fix behave tests on GH actions MacOS (#2515)

- the new MacOS doesn't play well with old go binaries (bump etcd)
- use brew to install Postgres and expect (unbuffer, to make behave output colorful) and use the latest version
- upload failed logs instead of grepping them to stdout

.github/workflows/tests.yaml

@@ -92,8 +92,8 @@ jobs:
     runs-on: ${{ fromJson('{"ubuntu":"ubuntu-20.04","windows":"windows-latest","macos":"macos-latest"}')[matrix.os] }}
     env:
       DCS: ${{ matrix.dcs }}
-      ETCDVERSION: 3.3.13
-      PGVERSION: 12.1-1  # for windows and macos
+      ETCDVERSION: 3.4.23
+      PGVERSION: 15.1-1  # for windows and macos
     strategy:
       fail-fast: false
       matrix:
@@ -133,6 +133,16 @@ jobs:
       run: python .github/workflows/install_deps.py
     - name: Run behave tests
       run: python .github/workflows/run_tests.py
+    - name: Upload logs if behave failed
+      uses: actions/upload-artifact@v3
+      if: failure()
+      with:
+        name: behave-${{ matrix.os }}-${{ matrix.dcs }}-${{ matrix.python-version }}-logs
+        path: |
+          features/output/*_failed/*postgres?.*
+          features/output/*
+        if-no-files-found: error
+        retention-days: 5
     - uses: actions/setup-python@v4
       with:
         python-version: '3.10'