it ALWAYS tries to build ghc from source. no matter which combination I use.

which is the current ghcup default.

don't use 0.0 MiB, which can be confusing.

auto invalidate all cached blocks.

in updateRDConfigFromEnvPure

all blocks are fetched.

should use path relative to the Makefile, not project root.

failed to use ghc from store, it insists build from source. I gave up.

minor fix on VERSION variable in Makefile

since I used setCurrentDirectory when serving static site,
combine webroot and user requested path will result in File Not
Found error. should always just use relative path or expand it to abs path.
I choose to expand abs path. This allow skip calculate sha1sum
when the same file is accessed via different webroot dir.

I pushed the patched code to gitlab

resolver: lts-20.26
this includes newer http-client which has the fix.

previously the regex capture didn't work when URL includes such string.
now I read path from http request directly, skip the regex capture.

- log msg is refined to print unicode string better on console.

tinylog is no longer in latest stackage lts.
RIO logging ts format is not customizable.
to make log using local timestamp, I need to switch to fast-logger.
I will defer this.

this allow rd-api to work on both ipv4 and ipv6 network by default.
when using 0.0.0.0, it won't work on ipv6 network.

- use io-thread-pool git repo URL in stack.yaml extra-deps. no longer require
  local copy of that library.
- update docs
- add source URL in pypi metadata.