ci: Check build result on pull_request

.github/workflows/main.yml

@@ -1,16 +1,17 @@
 name: build
-
 on:
     push:
       paths-ignore:
       - '**.md'
       - 'circuit'
-
+    pull_request:
+      paths-ignore:
+      - '**.md'
+      - 'circuit'
 
 # env:
 #   UPLOAD_USER_FIRMWARE: false
 
-
 jobs:
   build:
     runs-on: ubuntu-20.04
@@ -19,7 +20,6 @@ jobs:
       matrix:
         target-hardware: [esp8266, esp32, esp32c3, esp32s3]
 
-
     steps:
     - uses: actions/checkout@v4
       with:
@@ -58,7 +58,6 @@ jobs:
     #     echo "::set-output name=release_tag::UserBuild_$(date +"%Y.%m.%d_%H-%M")"
     #     echo "::set-output name=status::success"
 
-
     - name: Build for esp32/esp32c3
       if: matrix.target-hardware != 'esp8266'
       uses: espressif/esp-idf-ci-action@v1
@@ -67,7 +66,6 @@ jobs:
         target: ${{ matrix.target-hardware }}
         path: './'
 
-
     - name: Merge bin files (esp8266)
       if: matrix.target-hardware == 'esp8266'
       run: |