Revert "Update to go 1.19"

This reverts commit 7a5a75f.

golangci-lint needs to be build with go 1.19
see golangci/golangci-lint-action#442 (comment)

.github/renovate.json

@@ -9,7 +9,7 @@
     "SuperSandro2000"
   ],
   "constraints": {
-    "go": "1.19"
+    "go": "1.18"
   },
   "postUpdateOptions": [
     "gomodTidy",
@@ -20,7 +20,7 @@
       "matchPackageNames": [
         "golang"
       ],
-      "allowedVersions": "1.19.x"
+      "allowedVersions": "1.18.x"
     },
     {
       "matchPackagePrefixes": [

.github/workflows/ci.yaml

@@ -29,7 +29,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: "1.19"
+          go-version: "1.18"
       - name: Make build
         run: make build-all
   lint:
@@ -41,7 +41,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: "1.19"
+          go-version: "1.18"
       - name: Run golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
@@ -57,7 +57,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: "1.19"
+          go-version: "1.18"
       - name: Run tests and generate coverage report
         run: make build/cover.out
       - name: Upload coverage report to Coveralls

.github/workflows/license.yaml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: "1.19"
+          go-version: "1.18"
       - name: Check if source code files have license header
         run: |
           shopt -s globstar

go.mod

@@ -1,6 +1,6 @@
 module github.com/sapcc/go-makefile-maker
 
-go 1.19
+go 1.18
 
 require (
 	github.com/sapcc/go-bits v0.0.0-20220801132244-1778c461b6c3

internal/dockerfile/Dockerfile.template

@@ -1,4 +1,4 @@
 # renovate: datasource=docker depName=alpine versioning=docker
 ARG ALPINE_VERSION=3.16
 # renovate: datasource=docker depName=golang versioning=docker
-ARG GOLANG_VERSION=1.19.0-alpine
+ARG GOLANG_VERSION=1.18.4-alpine