Use workflow variables for tool versions in all workflows

.github/workflows/check-code-generation-task.yml

@@ -1,5 +1,9 @@
 name: Check Code Generation
 
+env:
+  # See: https://github.com/actions/setup-go/tree/v2#readme
+  GO_VERSION: "1.16"
+
 on:
   push:
     paths:
@@ -18,9 +22,6 @@ on:
       - "**/*.go"
       - "etc/schemas/**/*.json"
 
-env:
-  BUILDS_ARTIFACT: build-artifacts
-
 jobs:
   test-go:
     runs-on: ubuntu-latest
@@ -32,7 +33,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v2
         with:
-          go-version: "1.16"
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Install Taskfile
         uses: arduino/setup-task@v1

.github/workflows/deploy-cobra-mkdocs-versioned-poetry.yml

@@ -1,6 +1,10 @@
 # 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-python/tree/v2#available-versions-of-python
+  PYTHON_VERSION: "3.9"
+
 on:
   push:
     branches:
@@ -52,7 +56,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Install Poetry
         run: |

.github/workflows/spell-check-task.yml

@@ -1,6 +1,10 @@
 # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/spell-check-task.md
 name: Spell Check
 
+env:
+  # See: https://github.com/actions/setup-python/tree/v2#available-versions-of-python
+  PYTHON_VERSION: "3.9"
+
 # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
 on:
   push:
@@ -22,7 +26,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Install Poetry
         run: pip install poetry

.github/workflows/test-go-integration-task.yml

@@ -1,5 +1,11 @@
 name: Test Integration
 
+env:
+  # See: https://github.com/actions/setup-go/tree/v2#readme
+  GO_VERSION: "1.16"
+  # See: https://github.com/actions/setup-python/tree/v2#available-versions-of-python
+  PYTHON_VERSION: "3.9"
+
 on:
   push:
     paths:
@@ -40,7 +46,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v2
         with:
-          go-version: "1.16"
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Install Taskfile
         uses: arduino/setup-task@v1
@@ -51,7 +57,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Install Poetry
         run: pip install poetry

.github/workflows/test-go-task.yml

@@ -1,5 +1,9 @@
 name: Run tests
 
+env:
+  # See: https://github.com/actions/setup-go/tree/v2#readme
+  GO_VERSION: "1.16"
+
 on:
   push:
     paths:
@@ -18,9 +22,6 @@ on:
       - "**/*.go"
       - "**/testdata/**"
 
-env:
-  BUILDS_ARTIFACT: build-artifacts
-
 jobs:
   test-go:
     strategy:
@@ -39,7 +40,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v2
         with:
-          go-version: "1.16"
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Install Taskfile
         uses: arduino/setup-task@v1