ci: mirror firmware's size-report sidecar (OpenIPC/firmware#2166) (#102)

Firmware PR #2166 added a `size-report` Makefile target + the
`general/scripts/size_report.py` analyser that emits a per-package /
per-kernel-module `sizes.<soc>-<variant>.json` next to the .tgz. Builder
clones firmware fresh on every run and shells to `make BOARD=...`, so the
script + target are already available downstream — this PR adds the CI wiring
and manifest extension so the JSON ships as a release asset and surfaces
through https://openipc.github.io/builder/manifest.json.

Three changes:

* `builder.sh`: best-effort `make size-report` after the main build, and
  copy `sizes.*.json` into the timestamped archive next to `.tgz` /
  `rootfs.squashfs.*`. Failure is swallowed so a legacy `OPENIPC_FW_REV` pin
  to a pre-#2166 firmware ref can't sink the build.

* `.github/workflows/master.yml`: new `Build size report` step after the
  existing `Build firmware`. Mirrors the bimodal rename trick the .tgz path
  already does — compound matrix entries (`<soc>_<variant>_<vendor>-<model>`)
  share `<soc>_<variant>` and would otherwise collide on the firmware-side
  `sizes.<soc>-<variant>.json` filename when uploaded to the same release
  tag. Compound entries get the JSON renamed to `sizes.<NAME>.json`; simple
  entries keep `sizes.<soc>-<variant>.json`. `${{env.SIZES}}` is added to
  all three upload `files:` blocks (dated / nightly / latest).

* `.github/scripts/enrich_manifest.py`: `SIZES_COMPOUND_RE` +
  `SIZES_SIMPLE_RE`, a `parse_sizes()` helper that tries compound first
  (because `[^._-]+` in the simple soc class would otherwise accept the
  compound form too), the sidecar is recorded at the platform level under
  a `"sizes"` key in `manifest.json`, and a new `@sizes <build_id>
  <platform> <size> <url>` line type is emitted in `manifest.flat`
  alongside the existing `@channel` directive.

Schema is unchanged for existing consumers — on-device sysupgrade reads
positional 4-column `manifest.flat` lines and stays inert on unknown
`@`-prefixed directives.

Co-authored-by: John <zekccsripfwrocp-15689@yn.furvionx.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

builder.sh

@@ -57,6 +57,9 @@ copy_to_archive() {
         ${FIRMWARE_DIR}/output/images/openipc.*.tgz \
         ${BUILDER_DIR}/archive/${DEVICE}/${TIMESTAMP}
 
+    cp -a ${FIRMWARE_DIR}/output/images/sizes.*.json \
+        ${BUILDER_DIR}/archive/${DEVICE}/${TIMESTAMP} 2>/dev/null || true
+
     if [ -f "${FIRMWARE_DIR}/output/images/autoupdate-kernel.img" ]; then
         cp -a ${FIRMWARE_DIR}/output/images/autoupdate* ${BUILDER_DIR}/archive/${DEVICE}/${TIMESTAMP}
     fi
@@ -153,6 +156,11 @@ cp -afv ${BUILDER_DIR}/${ITEM}/* ${FIRMWARE_DIR}
 echo_c 33 "\nBuilding the device"
 make BOARD=${DEVICE}
 
+# Best-effort: emit per-package/per-kernel-module size JSON next to the .tgz.
+# Target lives in firmware's Makefile (PR #2166); ignore failure so legacy
+# pinned firmware refs without the target don't sink the build.
+make BOARD=${DEVICE} size-report || true
+
 copy_to_archive
 echo_c 35 "\nDone"
 cd "$BUILDER_DIR"