Add initial CI structure with composite actions and workflow

Co-authored-by: juanfeSanahuja <85166064+juanfeSanahuja@users.noreply.github.com>

Author: Copilot

.github/actions/setup-java-maven/action.yml

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+name: 'Setup Java and Maven'
+description: 'Composite action to set up Java and Maven environment for OpenCB/Xetabase projects'
+
+# TODO: Define inputs for Java version, Maven version, cache configuration, etc.
+# inputs:
+#   java-version:
+#     description: 'Java version to set up'
+#     required: false
+#     default: '11'
+
+# TODO: Define outputs if needed
+# outputs:
+#   java-version:
+#     description: 'Installed Java version'
+#     value: ${{ steps.setup.outputs.java-version }}
+
+runs:
+  using: 'composite'
+  steps:
+    # TODO: Add steps to set up Java
+    # TODO: Add steps to set up Maven
+    # TODO: Add caching for Maven dependencies
+    # TODO: Configure Maven settings if needed
+    - name: Placeholder
+      shell: bash
+      run: echo "Setup Java and Maven action - to be implemented"

.github/actions/test-summary/action.yml

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+name: 'Test Summary'
+description: 'Composite action to generate and publish test summaries for OpenCB/Xetabase projects'
+
+# TODO: Define inputs for test results paths, formats, etc.
+# inputs:
+#   test-results-path:
+#     description: 'Path to test results'
+#     required: false
+#     default: '**/target/surefire-reports/*.xml'
+
+# TODO: Define outputs if needed
+# outputs:
+#   summary:
+#     description: 'Test summary'
+#     value: ${{ steps.summary.outputs.summary }}
+
+runs:
+  using: 'composite'
+  steps:
+    # TODO: Add steps to collect test results
+    # TODO: Add steps to parse test results
+    # TODO: Add steps to generate summary
+    # TODO: Add steps to publish summary to GitHub Actions UI
+    - name: Placeholder
+      shell: bash
+      run: echo "Test summary action - to be implemented"

.github/workflows/build.yml

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+# TODO: Define build workflow for ci-core repository
+# This workflow will validate the composite actions and ensure they work correctly