Switch off debian:8 to debian:10 for the typescript build image

We only want to use an old version for glibc which the centos:7
image takes care of.

The old version of git used in debian:8 was causing problems
with the uid/gid passthrough with no user in passwd.

ci/dev/lint.sh

@@ -7,10 +7,7 @@ main() {
   eslint --max-warnings=0 --fix $(git ls-files "*.ts" "*.tsx" "*.js")
   stylelint $(git ls-files "*.css")
   tsc --noEmit
-  # See comment in ./ci/image/debian8
-  if [[ ! ${CI-} ]]; then
-    shellcheck -e SC2046,SC2164,SC2154,SC1091,SC1090,SC2002 $(git ls-files "*.sh")
-  fi
+  shellcheck -e SC2046,SC2164,SC2154,SC1091,SC1090,SC2002 $(git ls-files "*.sh")
 }
 
 main "$@"