Dockerfile: Remove an unused CEPH_TAG env variable
Ceph version is already available from CEPH_VERSION env variable.
CEPH_TAG on the other hand is only defined to determine the tag for
ceph base image and seems to be unused in the resulting go-ceph
container image.
@@ -5,10 +5,8 @@ FROM ${CEPH_IMG}:${CEPH_TAG}
# A CEPH_VERSION env var is already set in the base image.
# We save our build arg as GO_CEPH_VERSION and later ensure that
# the values agree to ensure we're building what we meant to build.
-ARG CEPH_TAG
ARG GO_CEPH_VERSION
-ENV GO_CEPH_VERSION=${GO_CEPH_VERSION:-$CEPH_VERSION} \
- CEPH_TAG=${CEPH_TAG}
+ENV GO_CEPH_VERSION=${GO_CEPH_VERSION:-$CEPH_VERSION}
RUN true && \
echo "Check: [ ${CEPH_VERSION} = ${GO_CEPH_VERSION} ]" && \
