ci: build and test with Go 1.23 (#1002)

This PR updates the Go version used in our CI to Go 1.23. See
hetznercloud/cli#871 for a previous discussion.

.github/workflows/build.yml

@@ -3,6 +3,9 @@ name: Build
 on:
   push:
 
+env:
+  GOTOOLCHAIN: local
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -13,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version: "1.23"
 
       - name: Import GPG key
         id: import_gpg

.github/workflows/lint.yml

@@ -5,14 +5,17 @@ on:
     branches: [main]
   pull_request:
 
+env:
+  GOTOOLCHAIN: local
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version: "1.23"
 
       - uses: golangci/golangci-lint-action@v6
         with:

.github/workflows/release.yml

@@ -5,6 +5,9 @@ on:
     tags:
       - "v*"
 
+env:
+  GOTOOLCHAIN: local
+
 jobs:
   release:
     runs-on: ubuntu-latest
@@ -17,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version: "1.23"
 
       - name: Import GPG key
         id: import_gpg

.github/workflows/test.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
 
+env:
+  GOTOOLCHAIN: local
+
 jobs:
   unit:
     runs-on: ubuntu-latest
@@ -14,7 +17,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version: "1.23"
 
       - run: go test -v -timeout=30s -parallel=8 -coverprofile=coverage.txt -coverpkg=./... ./...
 
@@ -71,7 +74,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version: "1.23"
 
       - uses: hetznercloud/tps-action@main
 

.gitlab-ci.yml

@@ -22,7 +22,7 @@ cache:
 
 build:
   stage: build
-  image: golang:1.21
+  image: golang:1.23
   script:
     - go env
     - go mod download
@@ -35,6 +35,6 @@ test:lint:
 
 test:unit:
   stage: test
-  image: golang:1.21
+  image: golang:1.23
   script:
     - make test

go.mod

@@ -2,6 +2,8 @@ module github.com/hetznercloud/terraform-provider-hcloud
 
 go 1.21
 
+toolchain go1.23.1
+
 require (
 	github.com/google/go-cmp v0.6.0
 	github.com/hashicorp/go-cty v1.4.1-0.20200723130312-85980079f637