config: trees: Add media-committers tree with next and fixes branches

[pawiecz]

Trees added by this PR were requested to be tested with fluster-debian Jobs. Currently there are up to 7 of them (depending on the hardware the tests are executed on):

$ grep -r "job: fluster.debian" config/ | sort -u
scheduler-chromeos.yaml:  - job: fluster-debian-av1
scheduler-chromeos.yaml:  - job: fluster-debian-av1-chromium-10bit
scheduler-chromeos.yaml:  - job: fluster-debian-h264
scheduler-chromeos.yaml:  - job: fluster-debian-h264-frext
scheduler-chromeos.yaml:  - job: fluster-debian-h265
scheduler-chromeos.yaml:  - job: fluster-debian-vp8
scheduler-chromeos.yaml:  - job: fluster-debian-vp9

All these Jobs are triggered by a KBuild Event kbuild-gcc-12-arm64-chromebook which has no run restrictions (rules: section) as of writing this comment.

Checkout Events on newly added trees should trigger fluster.debian* Jobs automatically.

[ndufresne]

Acked. I've circle it back with other maintainers, Hans Verkuil also confirmed.