chore: add cache to ci

Author: shinhyo

.github/workflows/Build.yaml

@@ -5,6 +5,7 @@ on:
     branches:
       - main
   pull_request:
+
 concurrency:
   group: build-${{ github.ref }}
   cancel-in-progress: true
@@ -30,6 +31,20 @@ jobs:
           distribution: 'zulu'
           java-version: 11
 
+      - name: chmod cache key
+        run: chmod +x ./scripts/checksum.sh
+
+      - name: Generate cache key
+        run: ./scripts/checksum.sh app checksum.txt
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches/modules-*
+            ~/.gradle/caches/jars-*
+            ~/.gradle/caches/build-cache-*
+          key: gradle-${{ hashFiles('checksum.txt') }}
+
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
 

scripts/checksum.sh

@@ -0,0 +1,26 @@
+# Cache check
+
+#!/bin/bash
+SAMPLE=$1
+RESULT_FILE=$2
+
+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 $SAMPLE -type f \( -name "build.gradle*" -o -name "gradle-wrapper.properties"  -o -name "robolectric.properties" \) -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 idempotent
+sort $RESULT_FILE -o $RESULT_FILE