s3fs uses reticulate/Python which significantly increases R process memory.
When pak tries to fork R to install package dependencies, the enlarged
process can't be duplicated within the container memory limit.
Now the install-deps step saves the S3 file listing as s3_cache.rds,
and the build step reads it with readRDS() — no s3fs loading needed.
The precompute script was constructing S3 paths as "redhat10" while
bincraft uses "rhel10" as the codename. This mismatch caused the
precompute to find no existing packages in S3, producing ~77K false
positive package versions that all get skipped at build time.
Now uses bincraft::set_codename() to ensure path alignment.
Also fixes nrow() vs length() in install-deps summary message.
packages-to-build.R now saves the full (Package, Version) data.table
so the build step can pass specific tags to build_binary_package(),
eliminating redundant per-package tag discovery and S3 checks.
Also reduces archive versions from 9 to 4 (+ 1 release = 5 total).
The S3 credentials, endpoint, and bucket name were still pointing to the old Hetzner storage after the Backblaze migration, causing silent build failures.
