Workflow improvements (#3891)

* add caching steps to build_check workflow

* add gradle.properites for github runner

* refactor ci-gradle.properties

* specify ndk versiion in build.gradle

* remove ndk install and cache steps from build_check

* moved runner files to separate folder

* refactor build_check.yml

.github/runner-files/checksum.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+RESULT_FILE=$1
+
+if [ -f $RESULT_FILE ]; then
+  rm $RESULT_FILE
+fi
+touch $RESULT_FILE
+
+checksum_file() {
+  echo $(openssl md5 $1 | awk '{print $2}')
+}
+
+FILES=()
+while read -r -d ''; do
+  FILES+=("$REPLY")
+done < <(find . -type f \( -name "build.gradle*" -o -name "Dependencies.kt" -o -name "gradle-wrapper.properties" \) -print0)
+
+# Loop through files and append MD5 to result file
+for FILE in ${FILES[@]}; do
+  echo $(checksum_file $FILE) >> $RESULT_FILE
+done
+# Now sort the file so that it is 
+sort $RESULT_FILE -o $RESULT_FILE

.github/runner-files/ci-gradle.properties

@@ -0,0 +1,6 @@
+org.gradle.daemon=false
+org.gradle.jvmargs=-Xmx5120m
+org.gradle.workers.max=2
+
+kotlin.incremental=false
+kotlin.compiler.execution.strategy=in-process

.github/workflows/build_check.yml

@@ -16,8 +16,24 @@ jobs:
         uses: actions/setup-java@v1
         with:
           java-version: 1.8
-      - name: Install NDK
-        run: sudo ${ANDROID_HOME}/tools/bin/sdkmanager --install "ndk;21.0.6113669" &> /dev/null
+
+      - name: Copy CI gradle.properties
+        run: |
+          mkdir -p ~/.gradle
+          cp .github/runner-files/ci-gradle.properties ~/.gradle/gradle.properties
+
+      - name: Generate Gradle cache key
+        run: ./.github/runner-files/checksum.sh checksum.txt
+
+      - name: Cache Gradle dependencies
+        uses: actions/cache@v2
+        continue-on-error: true # continue if the cache restore/upload fails
+        with:
+          path: |
+            ~/.gradle/caches/build-cache-*
+            ~/.gradle/caches/jars-*
+            ~/.gradle/caches/modules-*
+          key: ${{ runner.os }}-gradle-${{ hashFiles('checksum.txt') }}
 
       - name: Build app
         run: ./gradlew assembleStandardDebug

app/build.gradle

@@ -34,6 +34,7 @@ ext {
 android {
     compileSdkVersion AndroidConfig.compileSdk
     buildToolsVersion AndroidConfig.buildTools
+    ndkVersion AndroidConfig.ndk
 
     defaultConfig {
         applicationId "eu.kanade.tachiyomi"

buildSrc/src/main/kotlin/AndroidConfig.kt

@@ -3,4 +3,5 @@ object AndroidConfig {
     const val minSdk = 21
     const val targetSdk = 29
     const val buildTools = "29.0.3"
+    const val ndk = "21.3.6528147"
 }