Stopped the RISC-V install pulling a desktop media stack (#789)

The RISC-V job installs qemu-system-misc, ninja-build and cmake under a
two-minute per-attempt budget. With recommends enabled that install fetches 67
packages and 87 MB of archives, 388 MB unpacked, because qemu-system-misc
recommends gstreamer, pulseaudio, v4l and a set of codec libraries. Twenty-six
of the 67 are that media stack, and the job runs qemu-system-riscv64 headless.
On a slow mirror the download does not finish inside the budget, and all three
attempts time out.

The install now passes --no-install-recommends. Raising the budget was the
alternative and is not available: TIMEOUT_LONG is already sized so that three
attempts fit inside the ten-minute install step, as its own comment records.

Observed on the run for #783, where all three attempts timed out while a second
RISC-V run at the same minute succeeded, which is the mirror-speed dependence
this removes.

Assisted-by: Claude Code (Opus 5) <[email protected]>

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