Upgrade to Java 17

Psalmenweb-nieuw/Dockerfile

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+# Use OpenJDK 17 as the base image
+FROM openjdk:17-jdk-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the JAR file into the container
+# Replace 'your-app.jar' with your actual JAR file name
+COPY target/*.jar app.jar
+
+# Expose port 8090
+EXPOSE 8090
+
+# Create a non-root user for security
+RUN addgroup --system spring && adduser --system spring --ingroup spring
+USER spring:spring
+
+# Run the application
+ENTRYPOINT ["java", "-jar", "app.jar"]