fix(ci): restore build log artifact upload for Companion CI (#7654)

Co-authored-by: Peter Feerick <5500713+pfeerick@users.noreply.github.com>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

.github/actions/build_companion/action.yml

@@ -59,12 +59,34 @@ runs:
         tools/build-companion.sh "$(pwd)" "$(pwd)/output/"
 
     - name: Compose release filename
+      if: always()
       run: echo "artifact_name=edgetx-cpn-${{ inputs.os }}-${GITHUB_REF##*/}" >> $GITHUB_ENV
       shell: bash
 
+    - name: Collect build logs
+      if: always()
+      shell: bash
+      run: |
+        mkdir -p logs
+
+        if [ -d "build" ]; then
+          find build -name "*.log" -type f -exec cp {} logs/ \; 2>/dev/null || true
+          find build -name "CMakeOutput.log" -type f -exec cp {} logs/ \; 2>/dev/null || true
+          find build -name "CMakeError.log" -type f -exec cp {} logs/ \; 2>/dev/null || true
+        fi
+
     - name: Archive production artifacts
       uses: actions/upload-artifact@v7
       with:
         name: "${{ env.artifact_name }}"
         path:  ${{github.workspace}}/output
         retention-days: 15
+
+    - name: Archive build logs
+      if: always()
+      uses: actions/upload-artifact@v7
+      with:
+        name: "${{ env.artifact_name }}-logs"
+        path: ${{github.workspace}}/logs
+        retention-days: 30
+        if-no-files-found: ignore