add: configure CI/CD workflows for build and formatting checks

Signed-off-by: Zach Harel <zach@zharel.me>

Author: zachwaffle4

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Run tests
+        run: ./gradlew test
+
+

.github/workflows/spotless.yml

@@ -0,0 +1,51 @@
+name: Spotless Check
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  spotless:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Run Spotless Apply
+        run: ./gradlew spotlessApply
+
+      - name: Check output
+        run: git --no-pager diff --exit-code HEAD
+
+      - name: Generate diff
+        run: git diff HEAD > javaformat-fixes.patch
+        if: ${{ failure() }}
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: javaformat fixes
+          path: javaformat-fixes.patch
+        if: ${{ failure() }}
+
+      - name: Write to job summary
+        run: |
+          echo '```diff' >> $GITHUB_STEP_SUMMARY
+          cat javaformat-fixes.patch >> $GITHUB_STEP_SUMMARY
+          echo '' >> $GITHUB_STEP_SUMMARY
+          echo '```' >> $GITHUB_STEP_SUMMARY
+        if: ${{ failure() }}