ci: combine DAPPER_OUTPUT

Signed-off-by: PoAn Yang <[email protected]>

Dockerfile.dapper

@@ -10,7 +10,7 @@ ENV PROTOBUF_VER=3.18.0
 ENV PATH /go/bin:$PATH
 ENV DAPPER_DOCKER_SOCKET true
 ENV DAPPER_ENV TAG REPO DRONE_REPO DRONE_PULL_REQUEST DRONE_COMMIT_REF
-ENV DAPPER_OUTPUT bin coverage.out
+ENV DAPPER_OUTPUT bin coverage.out ./integration/rpc/controller ./integration/rpc/replica ./proto
 ENV DAPPER_RUN_ARGS --privileged --tmpfs /go/src/github.com/longhorn/longhorn-engine/integration/.venv:exec --tmpfs /go/src/github.com/longhorn/longhorn-engine/integration/.tox:exec -v /dev:/host/dev -v /proc:/host/proc
 ENV DAPPER_SOURCE /go/src/github.com/longhorn/longhorn-engine
 WORKDIR ${DAPPER_SOURCE}
@@ -141,6 +141,5 @@ RUN cd /go/src/github.com/longhorn && \
 
 VOLUME /tmp
 ENV TMPDIR /tmp
-ENV DAPPER_OUTPUT ./integration/rpc/controller ./integration/rpc/replica ./proto
 ENTRYPOINT ["./scripts/entry"]
 CMD ["ci"]