feat(CI): add spell checker GitHub Action

- Run linters/spell checker only on pull request
- Update the CONTRIBUTING guide with documentation on the Golang library `misspell`

.github/workflows/lint.yml

@@ -1,6 +1,6 @@
 name: Lint
 
-on: [push, pull_request]
+on: [pull_request]
 
 jobs:
   markdownlint:

.github/workflows/spell-checker.yml

@@ -0,0 +1,17 @@
+name: 🎉 Spellchecker
+
+on: [pull_request]
+
+jobs:
+  misspell:
+    name: 🧹 Check Spelling
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🍄 Check Out
+        uses: actions/checkout@v2
+      - name: 🥑 Install
+        run: |
+          wget -O - -q https://git.io/misspell | sh -s -- -b .
+      - name: 🍊 Misspell
+        run: |
+          find . -type f | xargs ./misspell

CONTRIBUTING.md

@@ -15,21 +15,30 @@ So far we are only checking Markdown files in the pre-commit run.
 - [Markdownlint](https://www.npmjs.com/package/markdownlint-cli)
 - [Shellcheck](https://github.com/koalaman/shellcheck)
 - [yamllint](https://yamllint.readthedocs.io/en/stable/)
+- [Spell Checker](https://github.com/client9/misspell)
 
 We use `markdownlint` to lint the [Markdown](https://daringfireball.net/projects/markdown/):
 
 ```
 markdownlint '**/*.md' --ignore node_modules --fix
 ```
 
+We use `shellcheck` to lint the [shell script](https://en.wikipedia.org/wiki/Shell_script) files:
+
+```
+shellcheck donya.sh
+```
+
 We also use `yamllint` to lint the [YAML](https://yaml.org/) files:
 
 ```
 yamllint .
 ```
 
-We use `shellcheck` to lint the [shell script](https://en.wikipedia.org/wiki/Shell_script) files:
+We use `misspell` to check for spelling mistakes:
 
+```shell
+find . -type f | xargs ./misspell
 ```
-shellcheck donya.sh
-```
+
+Pass in `-w` to `misspell` for autocorrect.