Use go.mod as source of Go version number for workflows

Go is used in the development and maintenance of the project. A standardized version of Go is used for all operations.

This version is defined in the `go` directive of the go.mod metadata file.

Go is installed in the GitHub Actions runner environments using the "actions/setup-go" action, which also must be
configured to install the correct version of Go. Previously the version number for use by the "actions/setup-go" action
was defined in each workflow. This meant that we had multiple copies of the Go version information, all of which had to
be kept in sync.

Fortunately, support for using `go.mod` as the source of version information for the "actions/setup-go" action was
recently added. This means it is now possible for all workflows to get the Go version from a single source.

Author: per1234

Diff for: .github/workflows/check-code-generation-task.yml

@@ -1,9 +1,5 @@
 name: Check Code Generation
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 on:
   create:
   push:
@@ -61,7 +57,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2

Diff for: .github/workflows/check-go-dependencies-task.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-go-dependencies-task.md
 name: Check Go Dependencies
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
@@ -87,7 +83,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2
@@ -146,7 +142,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2

Diff for: .github/workflows/check-go-task.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-go-task.md
 name: Check Go
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
@@ -77,7 +73,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2
@@ -114,7 +110,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2
@@ -154,7 +150,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2
@@ -194,7 +190,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2
@@ -234,7 +230,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2

Diff for: .github/workflows/check-markdown-task.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-markdown-task.md
 name: Check Markdown
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
@@ -17,6 +13,8 @@ on:
       - "package-lock.json"
       - "Taskfile.ya?ml"
       - "**/.markdownlint*"
+      - "**/go.mod"
+      - "**/go.sum"
       - "**.mdx?"
       - "**.mkdn"
       - "**.mdown"
@@ -30,6 +28,8 @@ on:
       - "package-lock.json"
       - "Taskfile.ya?ml"
       - "**/.markdownlint*"
+      - "**/go.mod"
+      - "**/go.sum"
       - "**.mdx?"
       - "**.mkdn"
       - "**.mdown"
@@ -107,7 +107,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Setup Node.js
         uses: actions/setup-node@v4

Diff for: .github/workflows/check-mkdocs-task.yml

@@ -1,17 +1,15 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-mkdocs-task.md
 name: Check Website
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
   push:
     paths:
       - ".github/workflows/check-mkdocs-task.ya?ml"
       - "**/.npmrc"
+      - "**/go.mod"
+      - "**/go.sum"
       - "Taskfile.ya?ml"
       - "mkdocs.ya?ml"
       - "package.json"
@@ -26,6 +24,8 @@ on:
     paths:
       - ".github/workflows/check-mkdocs-task.ya?ml"
       - "**/.npmrc"
+      - "**/go.mod"
+      - "**/go.sum"
       - "Taskfile.ya?ml"
       - "mkdocs.ya?ml"
       - "package.json"
@@ -81,7 +81,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Python
         uses: actions/setup-python@v5

Diff for: .github/workflows/deploy-cobra-mkdocs-versioned-poetry.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/deploy-cobra-mkdocs-versioned-poetry.md
 name: Deploy Website
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 on:
   push:
     branches:
@@ -69,7 +65,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Python
         uses: actions/setup-python@v5

Diff for: .github/workflows/test-go-integration-task.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/test-go-integration-task.md
 name: Test Integration
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
@@ -81,7 +77,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Python
         uses: actions/setup-python@v5

Diff for: .github/workflows/test-go-task.yml

@@ -1,10 +1,6 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/test-go-task.md
 name: Test Go
 
-env:
-  # See: https://github.com/actions/setup-go/tree/main#supported-version-syntax
-  GO_VERSION: "1.17"
-
 # See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
 on:
   create:
@@ -91,7 +87,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install Task
         uses: arduino/setup-task@v2

Diff for: docs/CONTRIBUTING.md

@@ -76,7 +76,9 @@ submitting a PR:
 
 To build Arduino Lint from sources you need the following tools to be available in your local environment:
 
-- [Go](https://golang.org/doc/install) version 1.17 or later
+- [Go](https://golang.org/doc/install
+  - The **Go** version in use is defined in the `go` directive of
+    [`go.mod`](https://github.com/arduino/arduino-lint/blob/main/go.mod).
 - [Taskfile](https://taskfile.dev/#/installation) to help you run the most common tasks from the command line
 
 If you want to run integration tests or work on documentation, you will also need: