add pull_request action for forked repo

.github/workflows/build_pull_request.yml

@@ -22,6 +22,7 @@ jobs:
   build:
     name: Build app
     runs-on: ubuntu-latest
+    if: github.repository == github.event.pull_request.head.repo.full_name
 
     steps:
       - name: Clone repo

.github/workflows/build_pull_request_forked.yml

@@ -0,0 +1,73 @@
+name: PR forked build check
+on:
+  #  push:
+  #    branches:
+  #      - develop
+  #    paths-ignore:
+  #      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+  # Dispatch or Manual triggers
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build app
+    runs-on: ubuntu-latest
+    if: github.repository != github.event.pull_request.head.repo.full_name
+
+    steps:
+      - name: Clone repo
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        with:
+          fetch-depth: 0
+
+      - name: Validate Gradle Wrapper
+        uses: gradle/actions/wrapper-validation@af1da67850ed9a4cedd57bfd976089dd991e2582 # v4
+
+      - name: Dependency Review
+        uses: actions/dependency-review-action@5a2ce3f5b92ee19cbb1541a4984c76d921601d7c # v4.3.4
+
+      - name: Setup Android SDK
+        run: |
+          ${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin/sdkmanager "build-tools;29.0.3"
+
+      - name: Set up JDK
+        uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018 # v4.2.2
+        with:
+          java-version: 17
+          distribution: temurin
+
+      - name: Set up gradle
+        uses: gradle/actions/setup-gradle@af1da67850ed9a4cedd57bfd976089dd991e2582 # v4
+
+      - name: Build app and run unit tests
+        run: ./gradlew assembleDevDebug testDevDebugUnitTest testDebugUnitTest --stacktrace
+
+      - name: Rename apk
+        id: current_commit
+        run: |
+          set -x
+          echo "The git ref is: ${{ github.ref }}"
+          version_tag=p$(echo ${{ github.ref }} | cut -d '/' -f 3)
+          commit_count=$(git rev-list --count HEAD)
+          echo "VERSION_TAG=$version_tag"
+          echo "VERSION_TAG=$version_tag" >> $GITHUB_OUTPUT
+          echo "COMMIT_COUNT=$commit_count"
+          echo "COMMIT_COUNT=$commit_count" >> $GITHUB_OUTPUT
+          mv app/build/outputs/apk/dev/debug/app-dev-universal-debug.apk Komikku-$version_tag-d$commit_count.apk
+
+      - name: Upload APK
+        uses: actions/upload-artifact@834a144ee995460fba8ed112a2fc961b36a5ec5a # v4.3.6
+        with:
+          name: Komikku-${{ steps.current_commit.outputs.VERSION_TAG }}-r${{ steps.current_commit.outputs.COMMIT_COUNT }}.apk
+          path: ./*.apk
+          retention-days: 1