[#1504] don't ignore failures

.github/workflows/legacy-java.yml

@@ -0,0 +1,43 @@
+name: Build
+on: [ push, pull_request ]
+
+jobs:
+  build-java-5-6-7:
+    strategy:
+      matrix:
+        java-version: [ 6, 7 ]
+        os: [ubuntu-latest, windows-latest]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Configure Java 8
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: 8
+          cache: gradle
+
+      - name: Build with Java 8 once to download dependencies; HTTPS does not work with older Java versions
+        continue-on-error: true
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-version: 1.12
+          arguments: assemble --no-daemon
+
+      - name: Configure JDK ${{ matrix.java-version }}
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: ${{ matrix.java-version }}
+          cache: gradle
+
+      - name: Build
+        continue-on-error: true
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-version: 1.12
+          build-root-directory: picocli-legacy-tests/
+          arguments: clean build --no-daemon