build(docker): pre-touch symbol_lists.lock

To address:

    File "/emsdk/upstream/emscripten/tools/filelock.py", line 391, in _acquire
    fd = os.open(self._lock_file, open_mode)
PermissionError: [Errno 13] Permission denied:
'/emsdk/upstream/emscripten/cache/symbol_lists.lock'[

src/docker/itk-wasm/Dockerfile

@@ -40,7 +40,17 @@ COPY web-build /usr/local/bin/
 
 # Trigger Emscripten to cache builds of required system libraries
 ADD median-filter-pipelineCopy /median-filter-pipelineCopy
-RUN if [ $BASE_IMAGE = "itkwasm/emscripten-base" ]; then cd /median-filter-pipelineCopy; /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-flto=thin -s DISABLE_EXCEPTION_CATCHING=0'; rm -rf ./web-build; /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-flto -s DISABLE_EXCEPTION_CATCHING=0'; rm -rf ./web-build; /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-fno-lto -s DISABLE_EXCEPTION_CATCHING=1'; rm -rf /median-filter-pipelineCopy; chmod -R 777 /emsdk/upstream/emscripten/cache; fi
+RUN if [ $BASE_IMAGE = "itkwasm/emscripten-base" ]; then \
+  cd /median-filter-pipelineCopy && \
+  /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-flto=thin -s DISABLE_EXCEPTION_CATCHING=0' && \
+  rm -rf ./web-build && \
+  /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-flto -s DISABLE_EXCEPTION_CATCHING=0' && \
+  rm -rf ./web-build; /usr/local/bin/web-build emscripten-build -DCMAKE_EXE_LINKER_FLAGS='-fno-lto -s DISABLE_EXCEPTION_CATCHING=1' && \
+  rm -rf /median-filter-pipelineCopy && \
+  mkdir -p /emsdk/upstream/emscripten/cache/symbol_lists && \
+  touch /emsdk/upstream/emscripten/cache/symbol_lists.lock && \
+  chmod -R 777 /emsdk/upstream/emscripten/cache \
+  fi
 
 # Build-time metadata as defined at http://label-schema.org
 ARG BUILD_DATE