Add GitHub workflows for build and coverage

.github/workflows/coverage.yml

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Coverage
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8 ]
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v3
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+    - name: Set up JDK ${{ matrix.java }}
+      uses: actions/setup-java@v3
+      with:
+        distribution: adopt
+        java-version: ${{ matrix.java }}
+    - name: Build with Maven
+      run: mvn -V test jacoco:report --no-transfer-progress
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        # commons-math-core module current skips jacoco report
+        files: ./commons-math-neuralnet/target/site/jacoco/jacoco.xml,./commons-math-transform/target/site/jacoco/jacoco.xml,./commons-math-legacy-exception/target/site/jacoco/jacoco.xml,./commons-math-legacy-core/target/site/jacoco/jacoco.xml,./commons-math-legacy/target/site/jacoco/jacoco.xml

.github/workflows/maven.yml

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Java CI
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 11, 17 ]
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v3
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+    - name: Set up JDK ${{ matrix.java }}
+      uses: actions/setup-java@v3
+      with:
+        distribution: adopt
+        java-version: ${{ matrix.java }}
+    - name: Build with Maven
+      # Use the default goal
+      run: mvn -V --no-transfer-progress