Use ruby:2.7 image by default on CI/CD
Use ruby:2.7
image by default on CI/CD, which enables us to use ruby:2.7
in deploy
/release
jobs on CI/CD, instead of ruby:2.5
, the current default base image on gitlab.com.
Closes #27 (closed)
Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com
Edited by Takuya Noguchi