Add CI workflow to check for commonly misspelled words

On every push, pull request, and periodically, use codespell to check for commonly
misspelled words.

In the event of a false positive, the problematic word should be added, in all lowercase, to the `ignore-words-list`
field of `.codespellrc`. Regardless of the case of the word in the false positive, it must be in all lowercase in the
ignore list. The ignore list is comma-separated with no spaces.

Author: per1234

Diff for: .codespellrc

@@ -0,0 +1,9 @@
+# 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:
+ignore-words-list = ,
+skip = ./.git,./go.mod,./go.sum,./package-lock.json,./poetry.lock,./yarn.lock
+builtin = clear,informal,en-GB_to_en-US
+check-filenames =
+check-hidden =

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

@@ -0,0 +1,41 @@
+# 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:
+  pull_request:
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch new misspelling detections resulting from dictionary updates.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  spellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Spell check
+        run: task general:check-spelling

Diff for: Taskfile.yml

@@ -45,6 +45,22 @@ tasks:
     cmds:
       - npx prettier --write .
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check-task/Taskfile.yml
+  general:check-spelling:
+    desc: Check for commonly misspelled words
+    deps:
+      - task: poetry:install-deps
+    cmds:
+      - poetry run codespell
+
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check-task/Taskfile.yml
+  general:correct-spelling:
+    desc: Correct commonly misspelled words where possible
+    deps:
+      - task: poetry:install-deps
+    cmds:
+      - poetry run codespell --write-changes
+
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/poetry-task/Taskfile.yml
   poetry:install-deps:
     desc: Install dependencies managed by Poetry

Diff for: poetry.lock

@@ -9,6 +9,7 @@ python = "^3.9"
 
 [tool.poetry.dev-dependencies]
 yamllint = "^1.26.3"
+codespell = "^2.1.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]