chore(deps): update b3log/siyuan docker tag to v3.1.18

[renovate]

This PR contains the following updates:

Package	Update	Change
b3log/siyuan	patch	v3.1.17 -> v3.1.18

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[wanghe-fit2cloud]

There is an update to the image field from b3log/siyuan:v3.1.17 to b3log/siyuan:v3.1.18, which suggests that there has been a new release available on Docker Hub for SiYuan. This could be due to bug fixes, feature improvements, or security updates.

Potential Issues: There may not be any known issues with this specific version of SiYuan based solely on its name change. However, it's good practice to review the changelog for both versions to ensure no critical changes were made.

Optimization Suggestions:

1. Use Tag Constraints: Ensure your Kubernetes manifest (e.g., Deployment.yaml) specifies exact tags instead of using a range (v3.1.*). This allows better control over the image used and can help avoid unexpected behavior during upgrades.

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: siyuan-svc
     name: siyuan-service
   spec:
     replicas: 1
     strategy:
       type: RollingUpdate
     selector:
       matchLabels:
         app: siyuan-svc
     template:
       metadata:
         labels:
           app: siyuan-svc
       spec:
         containers:
         - image: b3log/siyuan:v3.1.18
           container_name: ${CONTAINER_NAME}
           restartPolicy: UnlessStopped
           ports:
             - containerPort: 6835
               protocol: TCP

2. Environment Variables: If you need to set environment variables specific to different production environments (Dev/Staging/Production), consider encapsulating them within separate config maps or secrets rather than hardcoding in your deployment files. This improves maintainability and scalability.

3. Consider Upgrading Dependencies:** Check if there are any compatibility requirements between the updated SiYuan version and other components such as database drivers, plugins, or third-party tools being used in your SIYuan instance. Upgrade dependencies only in cases where they resolve conflicts or improve performance.

4. Backup Strategy: Ensure you have a robust backup process in place before making significant updates like these. A complete dump of all data plus configuration settings should be stored separately.

By addressing these areas, you can minimize downtime and ensure smooth operation of the SiYuan service after updating to v3.1.18.