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>

.github/workflows/master.yml

@@ -279,6 +279,30 @@ jobs:
             exit 1
           fi
 
+      - name: Build size report
+        if: env.NORFW || env.NANDFW
+        run: |
+          cd openipc
+          NAME=${{matrix.platform}}
+          make BOARD=${NAME} size-report || \
+            { echo "::warning::size-report failed for ${NAME}"; exit 0; }
+          SIZES=$(find output/images -name 'sizes.*.json' | head -1)
+          if [ -z "${SIZES}" ]; then
+            exit 0
+          fi
+          # Mirror the .tgz rename trick: compound matrix entries
+          # (`<soc>_<variant>_<vendor>-<model>`) share `<soc>_<variant>` and
+          # would collide on the firmware-side `sizes.<soc>-<variant>.json`
+          # filename when uploaded to the same release tag. Rename to
+          # `sizes.<NAME>.json` so every compound device gets its own asset.
+          COMMON=$(echo ${NAME} | awk -F_ '{print NF-1}')
+          if [ ${COMMON} -eq 1 ]; then
+            echo "SIZES=openipc/${SIZES}" >> ${GITHUB_ENV}
+          else
+            mv ${SIZES} ../sizes.${NAME}.json
+            echo "SIZES=sizes.${NAME}.json" >> ${GITHUB_ENV}
+          fi
+
       - name: Upload firmware (dated)
         if: env.NORFW || env.NANDFW
         uses: softprops/action-gh-release@v2
@@ -292,6 +316,7 @@ jobs:
           files: |
             ${{env.NORFW}}
             ${{env.NANDFW}}
+            ${{env.SIZES}}
 
       - name: Upload firmware (rolling nightly)
         if: env.NORFW || env.NANDFW
@@ -305,6 +330,7 @@ jobs:
           files: |
             ${{env.NORFW}}
             ${{env.NANDFW}}
+            ${{env.SIZES}}
 
       - name: Upload firmware (latest — legacy alias)
         if: env.NORFW || env.NANDFW
@@ -314,6 +340,7 @@ jobs:
           files: |
             ${{env.NORFW}}
             ${{env.NANDFW}}
+            ${{env.SIZES}}
 
       - name: Send binary
         if: env.NORFW