build: adding valid_nightly_branch var to upload_binaries step

[algojack]

making that variable be in all nightly steps.

Doc on how to use that var (by Barbara):
https://algorand.atlassian.net/wiki/spaces/DEVOPS/pages/2459893761/How+to+Run+Nightly+Tests+on+go-algorand

tested with custom branch:
https://app.circleci.com/pipelines/github/algorand/go-algorand/9011/workflows/72c36c87-93ab-466b-b932-6f9b7c886b9f

[algolucky]

I like this change because then we can trigger nightlies from any branch without having to directly change code.

[codecov]

Codecov Report

Merging #4459 (cde46d1) into master (0c09407) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4459      +/-   ##
==========================================
- Coverage   55.25%   55.22%   -0.03%     
==========================================
  Files         398      398              
  Lines       50265    50265              
==========================================
- Hits        27772    27759      -13     
- Misses      20176    20188      +12     
- Partials     2317     2318       +1     

Impacted Files	Coverage Δ
ledger/tracker.go	74.89% <0.00%> (-2.98%)	⬇️
network/wsPeer.go	65.47% <0.00%> (-2.74%)	⬇️
catchup/service.go	68.64% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.63% <0.00%> (ø)
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

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