single CI script with tesseract 4 and 5

.github/workflows/R-CMD-check.yaml

@@ -23,7 +23,8 @@ jobs:
           - {os: windows-latest,    r: 'devel'}
           - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
-          - {os: ubuntu-20.04,    r: 'release'}
+          - {os: ubuntu-20.04,    r: 'release', tesseract_version: '4'}
+          - {os: ubuntu-20.04,    r: 'release', tesseract_version: '5'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
@@ -40,6 +41,13 @@ jobs:
           http-user-agent: ${{ matrix.config.http-user-agent }}
           use-public-rspm: true
 
+      - name: Install Tesseract 5
+        if: matrix.config.os == 'ubuntu-20.04' && matrix.config.tesseract_version == '5'
+        run: |
+          sudo add-apt-repository -y ppa:alex-p/tesseract-ocr5
+          sudo apt-get update
+          sudo apt-get install -y libtesseract-dev tesseract-ocr tesseract-ocr-eng
+
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
           extra-packages: rcmdcheck