bump .github and Dockerfile for go1.18

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
       - name: "setup go"
         uses: "actions/setup-go@v2"
         with:
-          go-version: "1.17"
+          go-version: "1.18"
       - name: "install python3-pytest"
         run: "sudo apt install -y python3-pytest"
       - name: "make install"

Dockerfile

@@ -1,5 +1,5 @@
 ## build ergo binary
-FROM golang:1.17-alpine3.13 AS build-env
+FROM golang:1.18-alpine3.13 AS build-env
 
 RUN apk add -U --force-refresh --no-cache --purge --clean-protected -l -u make git