chore(github-action): Check changes since previous commit

Signed-off-by: Pranav C <61551451+pranavxc@users.noreply.github.com>

.github/workflows/publish-blog.yml

@@ -11,10 +11,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          fetch-depth: 2
+          fetch-depth: 0
       - name: Check for update
         run: |
-          echo "CHANGED=$([[ $(git log --pretty=format:'%h' -n 1 --skip 1 | xargs  lerna ls --since | grep noco-blog) = noco-blog ]] && echo 'OK')" >> $GITHUB_ENV
+          echo "CHANGED=$([[ $(lerna ls --since ${{github.event.before}} | grep noco-blog) = noco-blog ]] && echo 'OK')" >> $GITHUB_ENV
 
       - uses: actions/setup-node@v2
         if: ${{ env.CHANGED == 'OK' }}

.github/workflows/publish-book.yml

@@ -11,10 +11,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          fetch-depth: 2
+          fetch-depth: 0
       - name: Check for update
         run: |
-          echo "CHANGED=$([[ $(git log --pretty=format:'%h' -n 1 --skip 1 | xargs  lerna ls --since | grep noco-book) = noco-book ]] && echo 'OK')" >> $GITHUB_ENV
+          echo "CHANGED=$([[ $(lerna ls --since ${{github.event.before}} | grep noco-book) = noco-book ]] && echo 'OK')" >> $GITHUB_ENV
 
       - uses: actions/setup-node@v2
         if: ${{ env.CHANGED == 'OK' }}

.github/workflows/publish-docs.yml

@@ -11,10 +11,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          fetch-depth: 2
+          fetch-depth: 0
       - name: Check for update
         run: |
-          echo "CHANGED=$([[ $(git log --pretty=format:'%h' -n 1 --skip 1 | xargs  lerna ls --since | grep noco-docs) = noco-docs ]] && echo 'OK')" >> $GITHUB_ENV
+          echo "CHANGED=$([[ $(lerna ls --since ${{github.event.before}} | grep noco-docs) = noco-docs ]] && echo 'OK')" >> $GITHUB_ENV
 
       - uses: actions/setup-node@v2
         if: ${{ env.CHANGED == 'OK' }}