workflows: add correct WAMR option

Signed-off-by: Patrick Stephens <pat@chronosphere.io>

Author: Patrick Stephens

dockerfiles/Dockerfile

@@ -72,7 +72,7 @@ ARG WAMR_BUILD_TARGET
 ARG EXTRA_CMAKE_FLAGS
 ENV EXTRA_CMAKE_FLAGS=${EXTRA_CMAKE_FLAGS}
 
-RUN [ -n "${WAMR_BUILD_TARGET:-}" ] && EXTRA_CMAKE_FLAGS="$EXTRA_CMAKE_FLAGS -DWAMR_BUILD_TARGET=$WAMR_BUILD_TARGET"; \
+RUN [ -n "${WAMR_BUILD_TARGET:-}" ] && export EXTRA_CMAKE_FLAGS="$EXTRA_CMAKE_FLAGS -DWAMR_BUILD_TARGET=$WAMR_BUILD_TARGET"; \
     cmake -DFLB_RELEASE=On \
     -DFLB_JEMALLOC=On \
     -DFLB_TLS=On \