CI debug: use symlink instead of copy

Author: be32826

.github/workflows/build.yml

@@ -180,9 +180,9 @@ jobs:
 
             # Copy the stable source directory instead of the run-specific one
             rm -rf linux
-            cp -r "$SOURCES_DIR" linux
+            ln -s /sources-dir linux
 
-            ./build.sh --targets "$TARGET" ${VERSIONS:+--versions "$VERSIONS"}
+            ./build.sh --targets "$TARGET" ${VERSIONS:+--versions "$VERSIONS"} --extra_docker_args "-v $SOURCES_DIR:/sources-dir"
 
             # Use a run-specific output directory to avoid clashes
             BUILD_OUTPUT="/home/runner/_shared/runs/$GITHUB_RUN_ID/build-output"