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]>

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/install_riscv.sh b/scripts/install_riscv.sh
index 42847625..21e3ac85 100755
--- a/scripts/install_riscv.sh
+++ b/scripts/install_riscv.sh
@@ -10,6 +10,8 @@
 # SPDX-License-Identifier: MIT
 ##############################################################################
 
+# Portions of this file were generated with AI assistance.
+
 # Install RISC-V bare-metal cross-compiler toolchain and QEMU for CI.
 set -e
 
@@ -48,7 +50,14 @@ if ! retry sudo "${TIMEOUT[@]}" apt-get "${APT_OPTIONS[@]}" update; then
     echo "install_riscv.sh: the real gate."
     echo ""
 fi
+# --no-install-recommends, because qemu-system-misc recommends a desktop media
+# stack it does not need here. With recommends the install fetches 67 packages
+# and 87 MB, 26 of them gstreamer, pulseaudio, v4l and codec libraries, for a
+# job that runs qemu-system-riscv64 headless. That download is what pushes the
+# install past its two-minute budget on a slow mirror, and a larger budget is
+# not available: TIMEOUT_LONG is already sized so three attempts fit the step cap.
 retry sudo "${TIMEOUT[@]}" apt-get "${APT_OPTIONS[@]}" install -y \
+    --no-install-recommends \
     qemu-system-misc \
     ninja-build \
     cmake || exit 1