fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE315-LIBRETLS-2428776
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-2426331
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-2426331
- https://snyk.io/vuln/SNYK-ALPINE315-ZLIB-2434420
- https://snyk.io/vuln/SNYK-ALPINE315-ZLIB-2976173

Author: snyk-bot

Dockerfile

@@ -3,7 +3,7 @@
 ##
 ## Build
 ##
-FROM golang:1.17.7-alpine AS build
+FROM golang:1.18.7-alpine AS build
 
 ENV PATH="${GOPATH}/bin:${PATH}"
 ENV LLVL=info