Use alpine:latest-based image in build-ce-packages/build-ee-packages jobs

Takuya Noguchirequested to merge
tnir-use-secure-docker-image into master

These jobs require only git and curl.

Use alpine:latest-based image in build-ce-packages/build-ee-packages jobs instead of alpine:3.11-based image (ruby:2.4-alpine is based on alpine:3.11).

These jobs were introduced in !179 (merged).

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com

Edited by Takuya Noguchi

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