Another typo.

Author: kevbite

.github/workflows/continuous-integration-workflow.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - name: Install PDFtk Server CLI
       if: ${{ matrix.os == 'ubuntu-latest' }}
-      run: sudo apt-get pdftk
+      run: sudo apt-get install pdftk
     - name: Install PDFtk Server CLI
       if: ${{ matrix.os == 'windows-latest' }}
       run: choco install pdftk-server