Implement basic operations

.github/workflows/maven.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - 'v[0-9]*'
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up JDK 17
+        uses: actions/setup-java@v1
+        with:
+          java-version: 17
+
+      - name: Checkout sources
+        uses: actions/checkout@v1
+
+      - name: Build with Maven
+        run: mvn --batch-mode -P jacoco verify
+
+      - name: Run SonarCloud analysis
+        run: >
+          mvn --batch-mode -DskipTests sonar:sonar
+          -Dsonar.host.url=https://sonarcloud.io
+          -Dsonar.organization=gridsuite
+          -Dsonar.projectKey=gridsuite_spreadsheet-config-server
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+
+      - name: Build Docker image - Main
+        if: github.ref == 'refs/heads/main'
+        run: >
+          mvn --batch-mode deploy -DskipTests -Dmaven.install.skip -Dmaven.deploy.skip -Dpowsybl.docker.deploy
+          -Djib.httpTimeout=60000
+          -Djib.to.image=docker.io/gridsuite/spreadsheet-config-server
+          -Djib.to.auth.username=gridsuiteci
+          -Djib.to.auth.password=${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build Docker image - Tag
+        if: startsWith(github.ref, 'refs/tags/')
+        run: >
+          mvn --batch-mode deploy -DskipTests -Dmaven.install.skip -Dmaven.deploy.skip -Dpowsybl.docker.deploy
+          -Djib.httpTimeout=60000
+          -Djib.to.image=docker.io/gridsuite/spreadsheet-config-server:${GITHUB_REF_NAME#v}
+          -Djib.to.auth.username=gridsuiteci
+          -Djib.to.auth.password=${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Broadcast update event
+        if: github.ref == 'refs/heads/main'
+        uses: gridsuite/broadcast-event@main
+        with:
+          token: ${{ secrets.REPO_ACCESS_TOKEN }}
+          event-type: spreadsheet_config_server_updated

.gitignore

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+# VSCode
+/.vscode
+/.settings
+.classpath
+.factorypath
+.project
+
+target/
+
+# IntelliJ
+/.idea
+*.iml