MNT: Add codespell configuration and infrastructure

Adds codespell to our collection of linting tools.

.codespellignore

@@ -0,0 +1 @@
+NAM

.github/workflows/linting.yml

@@ -46,4 +46,13 @@ jobs:
           REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           set -o pipefail
-          doc8 docs | reviewdog -efm='%f:%l: %m' -name=doc8 -reporter=github-check -filter-mode=nofilter
+          doc8 docs | reviewdog -efm='%f:%l: %m' -name=doc8 -reporter=github-check -filter-mode=nofilter
+
+      - name: Run codespell
+        # Don't skip codespell if any other steps fail
+        if: always()
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -o pipefail
+          codespell | reviewdog -efm='%f:%l: %m' -name=codespell -reporter=github-check -filter-mode=nofilter

ci/linting_requirements.txt

@@ -12,4 +12,6 @@ flake8-requirements==2.2.1
 flake8-rst-docstrings==0.2.7
 
 doc8==1.0.0
-restructuredtext_lint==1.4.0
+restructuredtext_lint==1.4.0
+
+codespell==2.3.0

pyproject.toml

@@ -62,6 +62,11 @@ extras = [
 "Bug Tracker" = "https://github.com/Unidata/siphon/issues"
 "Source Code" = "https://github.com/Unidata/siphon"
 
+[tool.codespell]
+skip = "*.ipynb,*.pdf,.git,./docs/build,./docs/examples,./tests/fixtures,./tests/cdmr/fixtures,AUTHORS.txt"
+exclude-file = ".codespellexclude"
+ignore-words = ".codespellignore"
+
 [tool.doc8]
 ignore-path = ["docs/build", "docs/api/generated", "docs/_templates", "docs/examples"]
 file-encoding = "utf8"