fix: move pull request details from run to env vars
#154
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This PR moves
PR_TITLE,PR_BODYet al from therunsection of the workflow (where it is susceptible to code injection) to theenvsection of the step.Special thanks to: Francesco Garofalo francesco.garofalo@goteleport.com for pointing out the potential security issue.
Reference: https://securitylab.github.com/research/github-actions-untrusted-input/