Get short phpstan-src SHA

Author: ondrejmirtes

.github/workflows/phar.yml

@@ -179,6 +179,11 @@ jobs:
           echo "$(git log ${{ steps.previous-commit.outputs.sha }}..${{ github.event.after }} --reverse --pretty='https://github.com/phpstan/phpstan-src/commit/%H %s')" >> $GITHUB_OUTPUT
           echo 'MESSAGE' >> $GITHUB_OUTPUT
 
+      - name: "Get short phpstan-src SHA"
+        id: short-src-sha
+        working-directory: phpstan-src
+        run: echo "sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
       - name: "Check PHAR checksum"
         id: checksum-difference
         working-directory: phpstan-dist