chore: typo-fix the docs in CI

.github/actions/diffs/action.yml

@@ -1,6 +1,9 @@
 name: Detect Changes
 description: Defines variables indicating the parts of the code that changed
 outputs:
+  isDoc:
+    description: True when changes happened to some documentation
+    value: "${{ steps.diff.outputs.isDoc }}"
   isRust:
     description: True when changes happened to the rust code
     value: "${{ steps.diff.outputs.isRust }}"
@@ -24,3 +27,7 @@ runs:
         isExplorerClient:
           - 'explorer/client/**'
           - '.github/workflows/explorer-client-prs.yml'
+        isDoc:
+          - 'doc/**'
+          - '*.md'
+          - '.github/workflows/docs.yml'

.github/workflows/docs.yml

@@ -0,0 +1,31 @@
+name: Documentation
+
+on:
+  push:
+    branches: [ main, extensions ]
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+
+jobs:
+  diff:
+    runs-on: [ubuntu-latest]
+    outputs:
+      isDoc: ${{ steps.diff.outputs.isDoc }}
+    steps:
+    - uses: actions/checkout@v3
+    - name: Detect Changes
+      uses: './.github/actions/diffs'
+      id: diff
+
+  spelling:
+    name: Lint documentation
+    needs: diff
+    if: needs.diff.outputs.isDoc == 'true'
+    runs-on: [ubuntu-latest]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Spell Check Docs
+      uses: crate-ci/typos@master
+      with:
+        files: ./doc ./*.md