[GitHub][workflows] Replace curl with sparse checkout (#78303)

Author: DavidSpickett

.github/workflows/issue-subscriber.yml

@@ -13,14 +13,20 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'llvm/llvm-project'
     steps:
+      - name: Checkout Automation Script
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: llvm/utils/git/
+          ref: main
+
       - name: Setup Automation Script
+        working-directory: ./llvm/utils/git/
         run: |
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/"$GITHUB_SHA"/llvm/utils/git/github-automation.py
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/"$GITHUB_SHA"/llvm/utils/git/requirements.txt
           chmod a+x github-automation.py
           pip install -r requirements.txt
 
       - name: Update watchers
+        working-directory: ./llvm/utils/git/
         # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
         env:
           LABEL_NAME: ${{ github.event.label.name }}

.github/workflows/new-prs.yml

@@ -34,14 +34,20 @@ jobs:
       (github.event.pull_request.author_association != 'MEMBER') &&
       (github.event.pull_request.author_association != 'OWNER')
     steps:
+      - name: Checkout Automation Script
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: llvm/utils/git/
+          ref: main
+
       - name: Setup Automation Script
+        working-directory: ./llvm/utils/git/
         run: |
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/main/llvm/utils/git/github-automation.py
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/main/llvm/utils/git/requirements.txt
           chmod a+x github-automation.py
           pip install -r requirements.txt
 
       - name: Greet Author
+        working-directory: ./llvm/utils/git/
         run: |
           ./github-automation.py \
             --token '${{ secrets.GITHUB_TOKEN }}' \

.github/workflows/pr-subscriber.yml

@@ -13,14 +13,20 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'llvm/llvm-project'
     steps:
+      - name: Checkout Automation Script
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: llvm/utils/git/
+          ref: main
+
       - name: Setup Automation Script
+        working-directory: ./llvm/utils/git/
         run: |
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/main/llvm/utils/git/github-automation.py
-          curl -O -L --fail https://raw.githubusercontent.com/"$GITHUB_REPOSITORY"/main/llvm/utils/git/requirements.txt
           chmod a+x github-automation.py
           pip install -r requirements.txt
 
       - name: Update watchers
+        working-directory: ./llvm/utils/git/
         run: |
           ./github-automation.py \
             --token '${{ secrets.ISSUE_SUBSCRIBER_TOKEN }}' \