Install wal-g from a precompiled bin

[hughcapet]

• decrease build time
• fix the problem of missing brotli compression type after upgrade to WAL-G v3 (ref. Makefile: change compilation and linking of libbrotli to optional (and off by default) wal-g/wal-g#1379)

[macedigital]

Are there tests covering the check whether wal-g supports brotli ?

It looks like we're relying on the fact that precompiled binaries (may have) enabled the optional brotli compression support by explicitly setting USE_BROTLI=1 at build time.

[hughcapet]

@macedigital Tests are currently covering our default configuration (not to use WAL-G for backup)
I tested this specific setup though (see the reverted commit)

[macedigital]

I think we should add tests for supported compression algorithms in general to Spilo, as lz4 or lzma might be dropped at one time in future as well. This would help detecting issues with creating or restoring from backups early.

Something like:

for algo in lz4 lzma brotli; do
  # ... verify backups can be created and restored from $algo
done

WDYT?

[hughcapet]

depending on how fast you need this fix to be rolled out and if you want to volunteer implementing it now:)
(this can also be a follow-up PR)

[macedigital]

depending on how fast you need this fix to be rolled out and if you want to volunteer implementing it now:) (this can also be a follow-up PR)

Could be a follow-up PR as fixing applying a fix for the missing brotli support is urgent.

[macedigital]

👍

[hughcapet]

👍