ci: build lemon-font firmware alongside standard on wio-tracker-v* tags

Add build-lemon-font job that checks out the font-experiments branch and
builds with FIRMWARE_VERSION suffixed with -lemon-font, producing files
like WioTrackerL1_*-v1.15-plus.1.7-lemon-font-SHA.uf2. A separate
release job collects artifacts from both builds into one draft release.
Tag pattern narrowed from wio-tracker-* to wio-tracker-v* to avoid
triggering on wio-tracker-lemon-* tags.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/build-wio-tracker-l1-firmwares.yml

@@ -7,11 +7,11 @@ on:
   workflow_dispatch:
   push:
     tags:
-      - 'wio-tracker-*'
+      - 'wio-tracker-v*'
 
 jobs:
 
-  build:
+  build-standard:
     runs-on: ubuntu-latest
     steps:
 
@@ -32,9 +32,52 @@ jobs:
           name: wio-tracker-l1-firmwares
           path: out
 
+  build-lemon-font:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Clone Repo (font-experiments branch)
+        uses: actions/checkout@v4
+        with:
+          ref: font-experiments
+
+      - name: Setup Build Environment
+        uses: ./.github/actions/setup-build-environment
+
+      - name: Build Lemon Font Firmwares
+        env:
+          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}-lemon-font
+        run: /usr/bin/env bash build.sh build-wio-tracker-l1-firmwares
+
+      - name: Upload Workflow Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: wio-tracker-l1-lemon-font-firmwares
+          path: out
+
+  release:
+    needs: [build-standard, build-lemon-font]
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    steps:
+
+      - name: Extract Version from Git Tag
+        run: echo "GIT_TAG_VERSION=v${GITHUB_REF_NAME#*-v}" >> $GITHUB_ENV
+
+      - name: Download Standard Firmwares
+        uses: actions/download-artifact@v4
+        with:
+          name: wio-tracker-l1-firmwares
+          path: out
+
+      - name: Download Lemon Font Firmwares
+        uses: actions/download-artifact@v4
+        with:
+          name: wio-tracker-l1-lemon-font-firmwares
+          path: out
+
       - name: Create Release
         uses: softprops/action-gh-release@v2
-        if: startsWith(github.ref, 'refs/tags/')
         with:
           name: Wio Tracker L1 Firmware ${{ env.GIT_TAG_VERSION }}
           body: ""