Update ubuntu-dev images to disable gh telemetry

[gokken-roko]

Changes

• Disable gh telemetry: https://cli.github.com/telemetry

Test

ubuntu-dev:22.04

$ cd 22.04/ubuntu-dev
$ docker build -t ghcr.io/cybozu/ubuntu-dev:test-22.04 --build-arg TAG=22.04 .
$ docker run --rm -it ghcr.io/cybozu/ubuntu-dev:test-22.04 bash
root@11aed3f3c549:/# env | grep GH_TELEMETRY
GH_TELEMETRY=false
root@11aed3f3c549:/# env | grep DO_NOT_TRACK
DO_NOT_TRACK=true

ubuntu-dev:24.04

$ cd 24.04/ubuntu-dev
$ docker build -t ghcr.io/cybozu/ubuntu-dev:test-24.04 --build-arg TAG=24.04 .
$ docker run --rm -it ghcr.io/cybozu/ubuntu-dev:test-24.04 bash
root@f48ecaa6375e:/# env | grep GH_TELEMETRY
GH_TELEMETRY=false
root@f48ecaa6375e:/# env | grep DO_NOT_TRACK
DO_NOT_TRACK=true

[takahiro-yamada]

LGTM