fix(seacogs): use env instead of run to set env vars

SeaCogs/Dockerfile

@@ -17,7 +17,7 @@ RUN apt-get install -y \
 RUN apt-get install -y ca-certificates curl gnupg
 RUN mkdir -p /etc/apt/keyrings
 RUN curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
-RUN export NODE_MAJOR=12
+ENV NODE_MAJOR=12
 RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_${NODE_MAJOR}.x focal main" | sudo tee /etc/apt/sources.list.d/nodesource.list > /dev/null
 RUN apt-get update && apt-get install -y nodejs