[Snyk] Security upgrade alpine from 3.14.0 to 3.18.6

[pbalogh-sa]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image. #### Changes included in this PR - Dockerfile We recommend upgrading to `alpine:3.18.6`, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected. Some of the most important vulnerabilities in your base image include: | Severity | Priority Score / 1000 | Issue | Exploit Maturity | | :------: | :-------------------- | :---- | :--------------- | |  | **714** | Out-of-bounds Read
[SNYK-ALPINE314-APKTOOLS-1533752](https://snyk.io/vuln/SNYK-ALPINE314-APKTOOLS-1533752) | No Known Exploit | |  | **714** | Buffer Overflow
[SNYK-ALPINE314-OPENSSL-1569445](https://snyk.io/vuln/SNYK-ALPINE314-OPENSSL-1569445) | No Known Exploit | |  | **714** | Buffer Overflow
[SNYK-ALPINE314-OPENSSL-1569445](https://snyk.io/vuln/SNYK-ALPINE314-OPENSSL-1569445) | No Known Exploit | |  | **614** | Loop with Unreachable Exit Condition ('Infinite Loop')
[SNYK-ALPINE314-OPENSSL-2426333](https://snyk.io/vuln/SNYK-ALPINE314-OPENSSL-2426333) | No Known Exploit | |  | **714** | Out-of-bounds Write
[SNYK-ALPINE314-ZLIB-2976174](https://snyk.io/vuln/SNYK-ALPINE314-ZLIB-2976174) | No Known Exploit | --- **Note:** _You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs._ For more information: 🧐 [View latest project report](https://app.snyk.io/org/banzaicloud/project/35a85238-7ac1-4e7a-bab8-7531723297de?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/banzaicloud/project/35a85238-7ac1-4e7a-bab8-7531723297de?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"5d0f0a81-d843-4b90-a370-09c79158c673","prPublicId":"5d0f0a81-d843-4b90-a370-09c79158c673","dependencies":[{"name":"alpine","from":"3.14.0","to":"3.18.6"}],"packageManager":"dockerfile","projectPublicId":"35a85238-7ac1-4e7a-bab8-7531723297de","projectUrl":"https://app.snyk.io/org/banzaicloud/project/35a85238-7ac1-4e7a-bab8-7531723297de?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-ALPINE314-APKTOOLS-1533752","SNYK-ALPINE314-OPENSSL-1569445","SNYK-ALPINE314-ZLIB-2976174","SNYK-ALPINE314-OPENSSL-2426333"],"upgrade":["SNYK-ALPINE314-APKTOOLS-1533752","SNYK-ALPINE314-OPENSSL-1569445","SNYK-ALPINE314-OPENSSL-1569445","SNYK-ALPINE314-OPENSSL-2426333","SNYK-ALPINE314-ZLIB-2976174"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[714,714,714,614],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io/?loc=fix-pr)

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