fix unbound variable error (bash not present) #14
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This PR proposes a solution for the issues with V2 (see #13 )
I duplicated the action as
jmm-render-md-mermaid
(sources at https://github.com/jmMeessen/jmm-render-md-mermaid)I am not sure if the code change fixed the problem or if it is because of the environment (more recent base images) but the test GH Action now works.