[task scheduler] Switch frontend to use basealpine
[task scheduler] Switch frontend to use basealpine

Change-Id: I2d1984c82cfb38f70a5570b60e681220ab23fb1d
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/249003
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot