fix: Configure env var for downstream build so it uses local deps (#514)

Author: jbelkins

.github/workflows/continuous-integration.yml

@@ -41,4 +41,4 @@ jobs:
         run: |
           python3 -c "from urllib.request import urlretrieve; urlretrieve('${{ env.BUILDER_HOST }}/${{ env.BUILDER_SOURCE }}/${{ env.BUILDER_VERSION }}/builder.pyz?run=${{ env.RUN }}', 'builder')"
           chmod a+x builder
-          AWS_CRT_SWIFT_CI_DIR="${{ env.AWS_CRT_SWIFT_CI_DIR }}" AWS_SDK_SWIFT_CI_DIR="${{ env.AWS_SDK_SWIFT_CI_DIR }}" SMITHY_SWIFT_CI_DIR="${{ env.SMITHY_SWIFT_CI_DIR }}" ./builder build -p ${{ env.PACKAGE_NAME }} --spec downstream
+          AWS_CRT_SWIFT_CI_DIR="${{ env.AWS_CRT_SWIFT_CI_DIR }}" AWS_SDK_SWIFT_CI_DIR="${{ env.AWS_SDK_SWIFT_CI_DIR }}" SMITHY_SWIFT_CI_DIR="${{ env.SMITHY_SWIFT_CI_DIR }}" AWS_SWIFT_SDK_USE_LOCAL_DEPS=1 ./builder build -p ${{ env.PACKAGE_NAME }} --spec downstream