fix: run conan export from src/ in build_cross.yml to match conan home

.conanrc sets conan_home=./build (relative). The pkvisor job checks out
into src/ and runs conan install with working-directory=src, so its
conan home resolves to src/build/. The export step was running from the
workspace root, writing to a different conan home (build/ instead of
src/build/), making the recipe invisible to conan install.

Fix: add working-directory: src to the export step so both steps share
the same conan home.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: leoparente

.github/workflows/build_cross.yml

@@ -123,7 +123,8 @@ jobs:
           restore-keys: conan-${{ runner.os }}-${{matrix.arch}}-
 
       - name: Export local Corrade recipe
-        run: conan export ${{github.workspace}}/src/conan/corrade/ --name=corrade --version=cci.20260327
+        working-directory: ${{github.workspace}}/src
+        run: conan export conan/corrade/ --name=corrade --version=cci.20260327
 
       - name: Install dependencies
         working-directory: ${{github.workspace}}/src