Download cfn-guard in pr-linter action

Author: QuantumNeuralCoder

.github/workflows/pr-linter.yml

@@ -111,7 +111,19 @@ jobs:
             echo "files_changed=false" >> $GITHUB_OUTPUT
           fi
 
+      - name: Install cfn-guard
+        if: steps.filter_files.outputs.files_changed == 'true'
+        run: |
+          mkdir -p $HOME/.local/bin
+          curl -L -o cfn-guard.tar.gz https://github.com/aws-cloudformation/cloudformation-guard/releases/latest/download/cfn-guard-v3-x86_64-ubuntu-latest.tar.gz
+          tar -xzf cfn-guard.tar.gz
+          mv cfn-guard-v3-*/cfn-guard $HOME/.local/bin/cfn-guard
+          chmod +x $HOME/.local/bin/cfn-guard
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+
       - name: Install & Build cfn-guard-custom-rules-tool
+        if: steps.filter_files.outputs.files_changed == 'true'
         run: yarn install --frozen-lockfile && cd tools/@aws-cdk/cfn-guard-custom-rules-tool && yarn build
 
       - name: Run cfn-guard if templates changed