fix: use GitHub vars instead of env vars

[mchristopher]

Summary

This PR updates the values in the GitHub release workflow to source values from GitHub variables and not environment variables.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
77.09%(+0.05%)	70.74%(+0.1%)	75.17%(+0.07%)	77.08%(+0.04%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
✅	✨ packages/account/src/assets/assets.ts	100% (+100%)	100% (+100%)	100% (+100%)	100% (+100%)
✅	✨ packages/account/src/assets/utils/fuelAssetsBaseUrl.ts	100% (+100%)	100% (+100%)	100% (+100%)	100% (+100%)
🔴	✨ packages/account/src/assets/utils/network.ts	91.3% (+91.3%)	83.33% (+83.33%)	100% (+100%)	91.3% (+91.3%)
✅	✨ packages/account/src/assets/utils/resolveIconPaths.ts	100% (+100%)	100% (+100%)	100% (+100%)	100% (+100%)
🔴	✨ packages/account/src/assets/utils/url.ts	100% (+100%)	88.88% (+88.88%)	100% (+100%)	100% (+100%)
🔴	packages/account/src/providers/provider.ts	68.52% (-0.03%)	58.91% (+0.45%)	70.21% (+0.32%)	68.26% (-0.02%)
🔴	packages/account/src/providers/generated/operations.ts	94.11% (+0.08%)	100% (+0%)	82% (+0.37%)	94.57% (+0.06%)
🔴	packages/address/src/address.ts	90.69% (-0.21%)	92.85% (+6.19%)	85.71% (+0%)	90.9% (-0.17%)
🔴	packages/address/src/utils.ts	80.95% (+11.72%)	68.75% (+18.75%)	83.33% (+5.56%)	81.39% (+11.02%)
🔴	packages/math/src/bn.ts	89.81% (+0.19%)	87.5% (+0.66%)	83.33% (+0%)	89.81% (+0.19%)