feat: add EXPOSE command to Dockerfile (#9458)

# Which Problems Are Solved
- Solves a problem of healthcheck/use of zitadel in gitlab CI pipeline

# How the Problems Are Solved

- Adds an EXPOSE command to the Dockerfile

# Additional Changes
# Additional Context

- https://docs.docker.com/reference/dockerfile/#expose
-
cc254e85ed/16/bookworm/Dockerfile (L218)

Co-authored-by: Maksim Khardin <maksim.khardin@distribusion.com>
Co-authored-by: Ramon <mail@conblem.me>
Co-authored-by: Livio Spring <livio.a@gmail.com>

build/Dockerfile

@@ -27,6 +27,7 @@ COPY --from=artifact /etc/ssl/certs /etc/ssl/certs
 COPY --from=artifact /app/zitadel /app/zitadel
 
 HEALTHCHECK NONE
+EXPOSE 8080
 
 USER zitadel
-ENTRYPOINT ["/app/zitadel"]
+ENTRYPOINT ["/app/zitadel"]