Fix ImageNotFound

Author: wxh06

.github/workflows/pythonpackage.yml

@@ -32,4 +32,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        docker pull openjdk && pytest --cov=.
+        docker pull openjdk && docker pull php && docker pull ruby && pytest --cov=.

.travis.yml

@@ -29,6 +29,8 @@ install:
   - docker pull clangbuiltlinux/ubuntu:llvm10-latest  # For clang-10 & clang++-10
   - docker pull clangbuiltlinux/ubuntu:llvm11-latest  # For clang-11 & clang++-11
   - docker pull bash  # For bash
+  - docker pull php  # For php
+  - docker pull ruby  # For ruby
 script:
   - make lint
   - make pytest