[skip ci] Split push and PR build workflows so they don't cancel each other

.github/workflows/build_pull_request.yml

@@ -0,0 +1,33 @@
+name: PR build check
+on:
+  pull_request:
+
+jobs:
+  build:
+    name: Build app
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clone repo
+        uses: actions/checkout@v2
+
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Copy CI gradle.properties
+        run: |
+          mkdir -p ~/.gradle
+          cp .github/runner-files/ci-gradle.properties ~/.gradle/gradle.properties
+
+      - name: Build app
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: assembleStandardRelease
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true

.github/workflows/build_push.yml

@@ -5,23 +5,10 @@ on:
       - master
     tags:
       - v*
-  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 app
-    needs: check_wrapper
     runs-on: ubuntu-latest
 
     steps:
@@ -33,6 +20,9 @@ jobs:
       - name: Clone repo
         uses: actions/checkout@v2
 
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:

.github/workflows/cancel_pull_request.yml

@@ -0,0 +1,15 @@
+name: Cancel old pull request workflows
+
+on:
+  workflow_run:
+    workflows: ["PR build check"]
+    types:
+      - requested
+
+jobs:
+  cancel:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: styfle/cancel-workflow-action@0.8.0
+      with:
+        workflow_id: ${{ github.event.workflow.id }}