Collect some artifacts of CI tests - initial commit

Author: danolivo

./workflows/c-cpp.yml

@@ -41,3 +41,19 @@ jobs:
 ./configure $CONFIGURE_OPTS CFLAGS="-DAQO_DEBUG_PRINT -O0"
 make -j4 > /dev/null && make -j4 -C contrib > /dev/null
 env CLIENTS=50 THREADS=50 make -C contrib/aqo check
+ - name: Archive regression.diffs
+if: ${{ always() }}
+uses: actions/upload-artifact@v3
+with:
+name: regression_diffs
+path: /home/runner/work/aqo/aqo/pg/contrib/aqo/regression.diffs
+retention-days: 1
+- name: Archive TAP tests log files
+if: ${{ always() }}
+uses: actions/upload-artifact@v3
+with:
+name: tap_logs
+path: |
+log
+ retention-days: 1
+