add github-desktop 3.4.15

[hboutemy]

https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/com/github/hazendaz/git/github-desktop/README.md

[github-actions]

• content/com/github/hazendaz/git/github-desktop/github-desktop-3.4.15.buildspec com.github.hazendaz.git:github-desktop

version=3.4.15
ok=4
ko=0
ignored=0
koFiles=""
ignoredFiles=""

docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk21-toolchains-21
	0:43.69 real,	0.11 user,	0.11 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk21-toolchains-21-maven-3.9.9
	0:05.65 real,	0.04 user,	0.06 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk21-toolchains-21-maven-3.9.9-runner
	0:07.74 real,	0.07 user,	0.05 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk21-toolchains-21-maven-3.9.9-runner-utc-en_us-022
	0:09.87 real,	0.07 user,	0.05 sys
docker run --name rebuild-central --rm
	2:03.10 real,	0.01 user,	0.01 sys