Add source URL comments to "template" project assets

This will make it easier for the maintainers to sync fixes and improvements in either direction between the upstream
"template" assets and their installation in this repository.

Author: per1234

.codespellrc

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check/.codespellrc
 # See: https://github.com/codespell-project/codespell#using-a-config-file
 [codespell]
 # In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:

.flake8

@@ -1,4 +1,7 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-python/.flake8
 # See: https://flake8.pycqa.org/en/latest/user/configuration.html
+# The code style defined in this file is the official standardized style to be used in all Arduino tooling projects and
+# should not be modified.
 
 [flake8]
 doctests = True

.github/dependabot.yml

@@ -3,6 +3,7 @@ version: 2
 
 updates:
   # Configure check for outdated GitHub Actions actions in workflows.
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/dependabot/README.md
   # See: https://docs.github.com/en/code-security/supply-chain-security/keeping-your-actions-up-to-date-with-dependabot
   - package-ecosystem: github-actions
     directory: / # Check the repository's workflows under /.github/workflows/

.github/workflows/check-license.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-license.md
 name: Check License
 
 env:

.github/workflows/check-prettier-formatting-task.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-prettier-formatting-task.md
 name: Check Prettier Formatting
 
 # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows

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

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-python-task.md
 name: Check Python
 
 env:

.github/workflows/check-taskfiles.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-taskfiles.md
 name: Check Taskfiles
 
 # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows

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

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/spell-check-task.md
 name: Spell Check
 
 env:

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

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/test-go-integration-task.md
 name: Test Integration
 
 env:

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

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/test-go-task.md
 name: Test Go
 
 env: