Debug msys codepage failure.

.github/workflows/windows-msys2.yml

@@ -94,6 +94,28 @@ jobs:
           fetch-depth: 1
           submodules: true
 
+      - name: Check environment
+        run: |
+            chcp
+            echo %PATH%
+            echo Lang:
+            echo %LANG%
+            echo LC_ALL:
+            echo %LC_ALL%
+            echo chcp.com:
+            chcp 65001
+            echo Printing unicode 1:
+            echo ✓
+            echo Printing unicode 2:
+            echo Блабла
+            where python
+            where python3
+            set PYTHONUTF8=1
+            echo Printing from Python:
+            python -c "print('\u2713')"
+            python -c "import sys; print(sys.stdout.encoding)"
+        shell: cmd
+
       - name: Install MSys
         uses: msys2/setup-msys2@v2
         with:
@@ -127,8 +149,31 @@ jobs:
 
       - name: Test
         run: |
+          # Change codepage to utf-8
+          cat /d/a/_temp/setup-msys2/msys2.CMD
+          echo $PATH
+          echo "Lang:"
+          echo $LANG || true
+          echo "LC_ALL:"
+          echo $LC_ALL || true
+          echo "chcp.com:"
+          chcp.com 65001 || true
+          echo "Printing unicode 1:"
+          echo -e "\xE2\x9C\x93"
+          echo "Printing unicode 2:"
+          printf "Блабла"
+          which python || true
+          which python3 || true
+          export PYTHONUTF8=1
+          echo "Printing from Python:"
+          python -c 'print("\u2713")' || true
+          python -c 'import sys; print(sys.stdout.encoding)' || true
           mkdir -p "build/Testing/Temporary"
           cp "cmake/CTestCostData.txt" "build/Testing/Temporary"
+          export LC_ALL="en_US.UTF-8"
+          export LANG="en_US.UTF-8"
+          export PYTHONIOENCODING=utf-8
+          export PYTHONUTF8=1
           export PATH="$PWD/build/src/lib:$PATH"
           export RNP_LOG_CONSOLE=1
           ctest --parallel ${{ env.CORES }} --test-dir build -C Debug --output-on-failure