These changes are split from #29774 and can be beneficial on their own.
The new BITCOINFUZZ environment variable complements the already existing set of variables used by tests: https://github.com/bitcoin/bitcoin/blob/b5d21182e5a66110ce2796c2c99da39c8ebf0d72/test/functional/test_framework/test_framework.py#L238-L243
The `BITCOINFUZZ` environment variable allows to override the default
path to the fuzz binary.
It complements the already existing set of variables used by tests:
- BITCOIND
- BITCOINCLI
- BITCOINUTIL
- BITCOINWALLET
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| Type | Reviewers |
|---|---|
| ACK | maflcko, davidgumberg |
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lgtm ACK 47cedee776c6253232beb6039ea708c578211327
utACK https://github.com/bitcoin/bitcoin/pull/29821/commits/47cedee776c6253232beb6039ea708c578211327
CI Failure appears unrelated