CI: Integrate ESMeta

.github/workflows/esmeta-test262.yml

@@ -0,0 +1,41 @@
+name: 'esmeta test262'
+
+on: [pull_request]
+
+jobs:
+  esmeta-test262:
+    name: 'esmeta test262'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 
+        uses: actions/checkout@v3
+      - name: Setup JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Add to PATH
+        shell: bash
+        run: |
+          echo "ESMETA_HOME=$(pwd)/vendor/esmeta" >> $GITHUB_ENV
+      - name: download esmeta
+        run: |
+          mkdir -p "${ESMETA_HOME}"
+          git clone --branch v0.1.0-rc8 --depth 1 https://github.com/es-meta/esmeta.git "${ESMETA_HOME}"
+          cd "${ESMETA_HOME}" && git submodule update --init --depth 1
+      - name: build esmeta
+        run: |
+          cd "${ESMETA_HOME}"
+          sbt assembly
+      - name: run test262
+        run: |
+          git fetch origin main
+          paths=$(git diff --diff-filter ACMR --name-only origin/main.. -- test/)
+          if [ "$paths" == "" ]; then
+            echo No test files added or modified. Exiting.
+            exit 0
+          fi
+          echo New or modified test files:
+          echo "$paths"
+          "${ESMETA_HOME}"/bin/esmeta test262-test -status -test262dir=$(pwd) $paths
+