Update release summary

Author: spuder

.github/workflows/build.yaml

@@ -23,11 +23,13 @@ jobs:
           touch firmware/secrets.yaml
           touch firmware/conf.d/secrets.yaml
 
+      - name: Set git sha
+        run: echo "RELEASE_SUMMARY=$(git log -1 --pretty=%B)" >> $GITHUB_ENV
       - name: Build ESPHome firmware
         uses: esphome/build-action@v4.0.2
         with:
           yaml-file: firmware/config.yaml
-          release-summary: "{{ github.event.head_commit.message }}"
+          release-summary: ${{ env.RELEASE_SUMMARY }}
           complete-manifest: true
           release-url: "https://raw.githubusercontent.com/spuder/OpenSpool/main/firmware/manifest.json"