HIL: replace build.flags_on with named build variants (#3687)

* test/hil: replace build.flags_on with named variant schema

Boards declare build variants as `variant: [{name, flags}]` instead of
`build.flags_on`. The variant `name` is the build dir (cmake-build-<name>) and
the HIL report row; `flags` is the raw CFLAGS string (-D...=1) injected via
CFLAGS_CLI. No `variant` => a single build named after the board.

- build.py: --build-name <name> (dir) + --cflag=<token> (raw CFLAGS, repeatable,
  =form survives the matrix's shell word-splitting); drop -f1/CFLAGS wrapping.
- hil_ci_set_matrix.py: emit one build arg per variant.
- hil_test.py: iterate variants; report row + build dir = variant name.
- hil_ci.sh: copy all cmake-build-<board>* dirs for -b runs.
- get_deps.py: accept (ignore) --build-name/--cflag from matrix args.
- tinyusb.json: migrate all 6 flags_on boards to variant.

* board_test: park CI build with busy spin instead of wfe

1 files changed, 9 insertions, 1 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e22ba909c..a7c7cf99a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -397,7 +397,15 @@ jobs:
         run: python3 tools/get_deps.py $BUILD_ARGS
 
       - name: Build
-        run: python3 tools/build.py --toolchain iar $BUILD_ARGS
+        run: |
+          # Each variant carries its own --build-name/--cflag, which are global to a
+          # single build.py invocation — so build one matrix entry at a time rather
+          # than joining them (joining would leak a variant's flags onto every board).
+          readarray -t ENTRIES < <(python test/hil/hil_ci_set_matrix.py test/hil/hfp.json | jq -r '.["arm-gcc"][]')
+          for entry in "${ENTRIES[@]}"; do
+            echo "+ tools/build.py --toolchain iar $entry"
+            python3 tools/build.py --toolchain iar $entry
+          done
 
       - name: Test on actual hardware (hardware in the loop)
         run: |