The build was failing with Prisma schema validation errors because Prisma
couldn't download engine binaries from binaries.prisma.sh (403 Forbidden).
This resulted in cryptic parsing errors during 'prisma generate'.
Changes:
- Add openssl and ca-certificates to deps stage for engine downloads
- Set PRISMA_ENGINES_CHECKSUM_IGNORE_MISSING to bypass checksum validation
- Pre-generate Prisma client with engines in deps stage
- Copy pre-generated client to builder stage to avoid re-downloading
- Set PRISMA_SKIP_POSTINSTALL_GENERATE in builder to prevent regeneration
This ensures engines are bundled during the deps stage and reused in
subsequent stages, eliminating network dependency during the build phase.
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