Reintroduce netgo (fix issues #12570 and #12556)

[antonis19]

Reintroducing netgo into the builds to fix the following issues:
#12556
#12570

netgo was removed in this PR:
#7421

but didn't seem to fix that issue.

[lystopad]

@antonis19 , hi
please, consider also add this tag to the following pipeline as well:
https://github.com/erigontech/erigon/blob/main/.github/workflows/ci-cd-main-branch-docker-images.yml

[AskAlexSharov]

my concern is: we don't know fail-reason.
it's ok for me to add netgo as a temporary workaround (we don't know if it's good workaround) - and merge. But after merge we must continue work on this issue - with high-prio until we find root cause and right fix.
compilation from source works on user's machines: go run ./cmd/erigon. Means: we will need fix for cross-compilation pipeline - to work with default golang's build tags (without netgo). also to add test-case on CI.

Possible steps to debug:

• strace CMD.... 2>&1 | grep -E '^open(at)?\(.*\.so' - or another tool to track sharedLibs/syscalls
• erigon --no-downloader --txpool.disable --http=false - or create sub-command which can reproduce issue without "startup and waiting for unknown time" (then we can add this sub-command to CI).
• I feel issue related to DNS discovery and static linking

cc: @antonis19 @lystopad @mh0lt