ci: Optimize Deploy Site workflow

.github/workflows/deploy-site.yml

@@ -32,15 +32,35 @@ jobs:
  - uses: actions/checkout@v3
  with:
  ref: master
+ fetch-depth: 2
+
+ - name: Check For Content Changes
+ id: check_changes
+ run: |
+ latest_commit=$(git rev-parse HEAD)
+ previous_commit=$(git rev-parse HEAD~1)
+ files_changed=$(git diff --name-only $previous_commit $latest_commit |
+ grep -E '\.(html|css|js|png|md|rst)$') || true
+
+ if [ -z "$files_changed" ]; then
+ echo "No relevant changes detected."
+ echo "changed=false" >> $GITHUB_OUTPUT
+ else
+ echo "Content changes detected:"
+ echo "$files_changed"
+ echo "changed=true" >> $GITHUB_OUTPUT
+ fi
 
  - name: Install Dependencies
+ if: steps.check_changes.outputs.changed == 'true'
  run: |
  sudo apt-get update
  sudo apt-get install -y doxygen tzdata
  python -m pip install --upgrade pip
  pip install -r requirements.txt 
 
  - name: Setup Project
+ if: steps.check_changes.outputs.changed == 'true'
  run: |
  cd ..
  git clone https://github.com/apache/mynewt-documentation
@@ -50,15 +70,19 @@ jobs:
  git clone https://github.com/apache/mynewt-newtmgr
 
  - name: Build Site
+ if: steps.check_changes.outputs.changed == 'true'
  run: ./build.py
 
  - name: Fetch Deployment Branch
+ if: steps.check_changes.outputs.changed == 'true'
  run: git fetch origin asf-site:asf-site
 
  - name: Deploy Site
+ if: steps.check_changes.outputs.changed == 'true'
  run: ./deploy.sh build
 
  - name: Create Pull Request
+ if: steps.check_changes.outputs.changed == 'true'
  uses: peter-evans/create-pull-request@v6
  with:
  token: ${{ secrets.GITHUB_TOKEN }}