feat(ci): migrates circleci to github actions

.github/workflows/build_and_test.yml

@@ -0,0 +1,98 @@
+name: Build and Test
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: openjdk:8-jdk
+    env:
+      _JAVA_OPTIONS: "-Xmx3G -Xms2G"
+    defaults:
+      run:
+        working-directory: .
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup System Tools
+        run: |
+          apt update -y
+          apt install -y gnupg2 curl
+      - name: Install Node.js
+        run: |
+          curl -fsSL https://deb.nodesource.com/setup_16.x | bash -
+          apt-get install -y nodejs
+      - name: Check Node.js version
+        run: node --version
+      - name: Verify files
+        run: |
+          curl -sSL https://secchannel.rsk.co/SUPPORT.asc | gpg2 --import -
+          gpg2 --verify SHA256SUMS.asc && sha256sum --check SHA256SUMS.asc
+
+      - name: List Files in gradle Directory
+        run: ls -al gradle && ls -al gradle/wrapper
+
+      - uses: actions/cache@v3
+        name: Cache Gradle
+        with:
+          path: |
+            .gradle/caches
+            gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', 'gradle/**/*') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Build
+        run: |
+          ./configure.sh
+          ./gradlew --no-daemon dependencies
+          ./gradlew --no-daemon --stacktrace build -x test
+          ls -la ./gradle/wrapper/gradle-wrapper.jar
+
+  rskj-unit-tests:
+    needs: build
+    runs-on: ubuntu-latest
+    container:
+      image: openjdk:8-jdk
+    defaults:
+      run:
+        working-directory: .
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup System Tools
+        run: |
+          apt update -y
+          apt install -y curl
+      - name: Install Node.js
+        run: |
+          curl -fsSL https://deb.nodesource.com/setup_16.x | bash -
+          apt-get install -y nodejs
+      - name: Check Node.js version
+        run: node --version
+
+      - uses: actions/cache@v3
+        name: Restore gradle cache
+        with:
+          path: |
+            .gradle/caches
+            gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', 'gradle/**/*') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Check Working Directory
+        run: pwd
+      - name: List Files in Current Directory
+        run: ls -al
+      - name: List Files in gradle Directory
+        run: ls -al gradle && ls -al gradle/wrapper
+      - name: rskj tests
+        run: |
+          chmod +x ./gradlew
+          ./gradlew --no-daemon --stacktrace test
+      - name: Save test results
+        run: |
+          mkdir -p ~/junit/
+          find rskj-core/build/test-results -type f -name "*.xml" -exec cp {} ~/junit/ \;
+        if: always()