Separate push and PR build workflows

.github/workflows/build_pull_request.yml

@@ -0,0 +1,43 @@
+name: PR build check
+
+on:
+  pull_request:
+
+jobs:
+  check_wrapper:
+    name: Validate Gradle Wrapper
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clone repo
+        uses: actions/checkout@v2
+
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+
+  build:
+    name: Build extension repo
+    needs: check_wrapper
+    if: "!startsWith(github.event.head_commit.message, '[SKIP CI]')"
+    runs-on: ubuntu-latest
+
+      - name: Checkout PR
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - name: Copy CI gradle.properties
+        run: |
+          mkdir -p ~/.gradle
+          cp .github/runner-files/ci-gradle.properties ~/.gradle/gradle.properties
+
+      - name: Build extensions
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: assembleRelease
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true

.github/workflows/build_push.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
       - master
-  pull_request:
 
 jobs:
   check_wrapper:
@@ -58,7 +57,7 @@ jobs:
           configuration-cache-enabled: true
 
       - name: Sign APKs
-        if: github.event_name == 'push' && github.repository == 'tachiyomiorg/tachiyomi-extensions'
+        if: github.repository == 'tachiyomiorg/tachiyomi-extensions'
         run: |
           cd master
           ./.github/scripts/sign-apks.sh \
@@ -68,20 +67,20 @@ jobs:
             ${{ secrets.KEY_PASSWORD }}
 
       - name: Create repo artifacts
-        if: github.event_name == 'push' && github.repository == 'tachiyomiorg/tachiyomi-extensions'
+        if: github.repository == 'tachiyomiorg/tachiyomi-extensions'
         run: |
           cd master
           ./.github/scripts/create-repo.sh
 
       - name: Checkout repo branch
-        if: github.event_name == 'push' && github.repository == 'tachiyomiorg/tachiyomi-extensions'
+        if: github.repository == 'tachiyomiorg/tachiyomi-extensions'
         uses: actions/checkout@v2
         with:
           ref: repo
           path: repo
 
       - name: Deploy repo
-        if: github.event_name == 'push' && github.repository == 'tachiyomiorg/tachiyomi-extensions'
+        if: github.repository == 'tachiyomiorg/tachiyomi-extensions'
         run: |
           cd repo
           ../master/.github/scripts/commit-repo.sh