Fix template injection and script expansion in github workflows #627
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By only expanding template values in the job as environment variables instead of in-line in 'run:' and 'script:' blocks we can broadly avoid injection issues via template expansion. This change broadly implements this best practice fix as well as ensuring safe use of environment variables within 'run:' and 'script:' blocks as needed to avoid shell and script expansion issues. For reference, see: https://github.blog/security/vulnerability-research/how-to-catch-github-actions-workflow-injections-before-attackers-do/#h-explaining-actions-workflow-injections
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Originally done in #625. I am creating a separate PR to handle merge conflicts.