Add GitHub Actions workflow to build and deploy plugin to OMCSI#85

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Commits on Mar 8, 2026

Initial plan
Copilot
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Add GitHub Actions workflow to build and deploy plugin to OMCSI

Copilot
and
dmccoystephenson
committed
Address review: add Maven cache, validate secrets, add --show-error to curl

Copilot
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dmccoystephenson
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