CI: Check assertion output more rigorously, and add LFortran:latest #70
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Extend steps that run assertion failures to check not only the expected exit code, but also that the output appears to include a legible assertion message. This is intended to catch cases where the ERROR STOP character output is garbled, a defect we've now separately seen from two compilers.
New CHECK_ASSERT variable factors this logic and applies it where appropriate.
Also add testing of LFortran:latest using the container built from lfortran:main
Force bash as the default shell, because otherwise containers default to /bin/sh