chore(ci): improve build and test workflows

Author: ThibaultBee

.github/workflows/build.yml

@@ -1,8 +1,8 @@
 # This workflow will build a Java project with Gradle
 
-name: Build
+name: Build and unit test
 
-on: [push]
+on: [ push ]
 
 jobs:
   build:
@@ -13,6 +13,12 @@ jobs:
         with:
           java-version: '21'
           distribution: 'adopt'
+      - name: Cache Gradle packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Assemble
@@ -24,3 +30,30 @@ jobs:
           path: |
             demos/**/build/outputs/apk/debug/*.apk
 
+  unit-tests:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'adopt'
+      - name: Cache Gradle packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Make gradlew executable
+        working-directory: .
+        run: chmod +x ./gradlew
+      - name: Run unit tests
+        working-directory: .
+        run: ./gradlew test
+      - name: Upload test reports
+        if: ${{ !cancelled() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-reports
+          path: '**/build/reports/tests'

.github/workflows/test.yml

@@ -6,24 +6,6 @@ name: Run tests
 on: [ push ]
 
 jobs:
-  unit-tests:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
-        with:
-          java-version: '21'
-          distribution: 'adopt'
-      - name: Make gradlew executable
-        run: chmod +x ./gradlew
-      - name: Run unit test
-        run: ./gradlew test
-      - name: Upload test reports
-        if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v4
-        with:
-          name: test-reports-${{ matrix.api-level }}
-          path: '**/build/reports/tests'
   instrumented-tests:
     runs-on: ubuntu-latest
     timeout-minutes: 55